21207496 has 48 divisors (see below), whose sum is σ = 43419600. Its totient is φ = 9682560.

The previous prime is 21207493. The next prime is 21207499. The reversal of 21207496 is 69470212.

It is an interprime number because it is at equal distance from previous prime (21207493) and next prime (21207499).

It is not an unprimeable number, because it can be changed into a prime (21207493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 255471 + ... + 255553.

It is an arithmetic number, because the mean of its divisors is an integer number (904575).

Almost surely, 2^21207496 is an apocalyptic number.

It is an amenable number.

21207496 is an abundant number, since it is smaller than the sum of its proper divisors (22212104).

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

21207496 is a wasteful number, since it uses less digits than its factorization.

21207496 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 21207496 is about 4605.1597149285. The cubic root of 21207496 is about 276.7981169195.

The spelling of 21207496 in words is "twenty-one million, two hundred seven thousand, four hundred ninety-six".