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21673874539 = 184711734637
BaseRepresentation
bin10100001011110111…
…010001010001101011
32001221111012220110001
4110023313101101223
5323342002441124
613542402203431
71365045615412
oct241367212153
961844186401
1021673874539
119212378809
12424a653577
132075407945
14109872a479
1586cbadb44
hex50bdd146b

21673874539 has 4 divisors (see below), whose sum is σ = 21685611024. Its totient is φ = 21662138056.

The previous prime is 21673874527. The next prime is 21673874581. The reversal of 21673874539 is 93547837612.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21673874539 - 211 = 21673872491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21673874539.

It is not an unprimeable number, because it can be changed into a prime (21673875539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5865472 + ... + 5869165.

It is an arithmetic number, because the mean of its divisors is an integer number (5421402756).

Almost surely, 221673874539 is an apocalyptic number.

21673874539 is a deficient number, since it is larger than the sum of its proper divisors (11736485).

21673874539 is a wasteful number, since it uses less digits than its factorization.

21673874539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11736484.

The product of its digits is 7620480, while the sum is 55.

The spelling of 21673874539 in words is "twenty-one billion, six hundred seventy-three million, eight hundred seventy-four thousand, five hundred thirty-nine".

Divisors: 1 1847 11734637 21673874539