21280692 has 24 divisors (see below), whose sum is σ = 49839552. Its totient is φ = 7067200.

The previous prime is 21280691. The next prime is 21280709. The reversal of 21280692 is 29608212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21280691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 217 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (2076648).

Almost surely, 2^21280692 is an apocalyptic number.

It is an amenable number.

21280692 is an abundant number, since it is smaller than the sum of its proper divisors (28558860).

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

21280692 is a wasteful number, since it uses less digits than its factorization.

21280692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6599 (or 6597 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 21280692 is about 4613.1000422709. The cubic root of 21280692 is about 277.1162002105.

The spelling of 21280692 in words is "twenty-one million, two hundred eighty thousand, six hundred ninety-two".