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21691334 = 279715973
BaseRepresentation
bin101001010111…
…1101111000110
31111211000220202
41102233233012
521023110314
62052530502
7352242020
oct122575706
944730822
1021691334
1111276025
127320a32
134656212
142c49010
151d870de
hex14afbc6

21691334 has 16 divisors (see below), whose sum is σ = 37570848. Its totient is φ = 9199872.

The previous prime is 21691309. The next prime is 21691343. The reversal of 21691334 is 43319612.

It is a junction number, because it is equal to n+sod(n) for n = 21691297 and 21691306.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6629 + ... + 9344.

It is an arithmetic number, because the mean of its divisors is an integer number (2348178).

Almost surely, 221691334 is an apocalyptic number.

21691334 is a deficient number, since it is larger than the sum of its proper divisors (15879514).

21691334 is a wasteful number, since it uses less digits than its factorization.

21691334 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16079.

The product of its digits is 3888, while the sum is 29.

The square root of 21691334 is about 4657.3956241659. The cubic root of 21691334 is about 278.8873103395.

The spelling of 21691334 in words is "twenty-one million, six hundred ninety-one thousand, three hundred thirty-four".

Divisors: 1 2 7 14 97 194 679 1358 15973 31946 111811 223622 1549381 3098762 10845667 21691334