21232497 has 32 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 11592000.

The previous prime is 21232493. The next prime is 21232511. The reversal of 21232497 is 79423212.

It is not a de Polignac number, because 21232497 - 2² = 21232493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21232493) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17872 + ... + 19022.

It is an arithmetic number, because the mean of its divisors is an integer number (1064448).

Almost surely, 2^21232497 is an apocalyptic number.

It is an amenable number.

21232497 is a deficient number, since it is larger than the sum of its proper divisors (12829839).

21232497 is a wasteful number, since it uses less digits than its factorization.

21232497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221.

The product of its digits is 6048, while the sum is 30.

The square root of 21232497 is about 4607.8733706559. The cubic root of 21232497 is about 276.9068443892.

The spelling of 21232497 in words is "twenty-one million, two hundred thirty-two thousand, four hundred ninety-seven".