21490296 has 32 divisors (see below), whose sum is σ = 54334800. Its totient is φ = 7082240.

The previous prime is 21490283. The next prime is 21490309. The reversal of 21490296 is 69209412.

It is an interprime number because it is at equal distance from previous prime (21490283) and next prime (21490309).

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, 2895 + ... + 7166.

Almost surely, 2^21490296 is an apocalyptic number.

It is an amenable number.

21490296 is an abundant number, since it is smaller than the sum of its proper divisors (32844504).

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

21490296 is a wasteful number, since it uses less digits than its factorization.

21490296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10159 (or 10155 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21490296 is about 4635.7627204161. The cubic root of 21490296 is about 278.0230472758.

The spelling of 21490296 in words is "twenty-one million, four hundred ninety thousand, two hundred ninety-six".