21262497 has 16 divisors (see below), whose sum is σ = 29578752. Its totient is φ = 13570560.

The previous prime is 21262469. The next prime is 21262519. The reversal of 21262497 is 79426212.

It is not a de Polignac number, because 21262497 - 2⁶ = 21262433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21262697) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7843 + ... + 10199.

It is an arithmetic number, because the mean of its divisors is an integer number (1848672).

Almost surely, 2^21262497 is an apocalyptic number.

It is an amenable number.

21262497 is a deficient number, since it is larger than the sum of its proper divisors (8316255).

21262497 is a wasteful number, since it uses less digits than its factorization.

21262497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488.

The product of its digits is 12096, while the sum is 33.

The square root of 21262497 is about 4611.1275193818. The cubic root of 21262497 is about 277.0371995378.

The spelling of 21262497 in words is "twenty-one million, two hundred sixty-two thousand, four hundred ninety-seven".