21690696 has 32 divisors (see below), whose sum is σ = 54394560. Its totient is φ = 7207872.

The previous prime is 21690653. The next prime is 21690703. The reversal of 21690696 is 69609612.

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, 7741 + ... + 10163.

It is an arithmetic number, because the mean of its divisors is an integer number (1699830).

Almost surely, 2^21690696 is an apocalyptic number.

It is an amenable number.

21690696 is an abundant number, since it is smaller than the sum of its proper divisors (32703864).

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

21690696 is a wasteful number, since it uses less digits than its factorization.

21690696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2805 (or 2801 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 21690696 is about 4657.3271304472. The cubic root of 21690696 is about 278.8845760394.

The spelling of 21690696 in words is "twenty-one million, six hundred ninety thousand, six hundred ninety-six".