21695412 has 24 divisors (see below), whose sum is σ = 52256512. Its totient is φ = 6998400.

The previous prime is 21695407. The next prime is 21695423. The reversal of 21695412 is 21459612.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 21695412.

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, 28789 + ... + 29532.

Almost surely, 2^21695412 is an apocalyptic number.

It is an amenable number.

21695412 is an abundant number, since it is smaller than the sum of its proper divisors (30561100).

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

21695412 is a wasteful number, since it uses less digits than its factorization.

21695412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58359 (or 58357 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 21695412 is about 4657.8334019155. The cubic root of 21695412 is about 278.9047863076.

The spelling of 21695412 in words is "twenty-one million, six hundred ninety-five thousand, four hundred twelve".