21030696 has 24 divisors (see below), whose sum is σ = 56958330. Its totient is φ = 7010208.

The previous prime is 21030677. The next prime is 21030703. The reversal of 21030696 is 69603012.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 509796 = 4530^2 + 714^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145975 + ... + 146118.

Almost surely, 2^21030696 is an apocalyptic number.

It is an amenable number.

21030696 is an abundant number, since it is smaller than the sum of its proper divisors (35927634).

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

21030696 is a wasteful number, since it uses less digits than its factorization.

21030696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292105 (or 292098 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 21030696 is about 4585.9236801325. The cubic root of 21030696 is about 276.0267774902.

The spelling of 21030696 in words is "twenty-one million, thirty thousand, six hundred ninety-six".