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21936039894 = 233406222961
BaseRepresentation
bin10100011011011111…
…010110011111010110
32002121202112021201000
4110123133112133112
5324411111234034
614024405244130
71404411156036
oct243337263726
962552467630
1021936039894
11933736049a
124302403646
1320b7819682
1410c14918c6
15885be7599
hex51b7d67d6

21936039894 has 16 divisors (see below), whose sum is σ = 48746755440. Its totient is φ = 7312013280.

The previous prime is 21936039893. The next prime is 21936039967. The reversal of 21936039894 is 49893063912.

21936039894 is a `hidden beast` number, since 2 + 193 + 60 + 398 + 9 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 406222961 = 21936039894 / (2 + 1 + 9 + 3 + 6 + 0 + 3 + 9 + 8 + 9 + 4).

It is a self number, because there is not a number n which added to its sum of digits gives 21936039894.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21936039893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 203111427 + ... + 203111534.

It is an arithmetic number, because the mean of its divisors is an integer number (3046672215).

Almost surely, 221936039894 is an apocalyptic number.

21936039894 is an abundant number, since it is smaller than the sum of its proper divisors (26810715546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21936039894 is a wasteful number, since it uses less digits than its factorization.

21936039894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406222972 (or 406222966 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The spelling of 21936039894 in words is "twenty-one billion, nine hundred thirty-six million, thirty-nine thousand, eight hundred ninety-four".

Divisors: 1 2 3 6 9 18 27 54 406222961 812445922 1218668883 2437337766 3656006649 7312013298 10968019947 21936039894