21751292 has 12 divisors (see below), whose sum is σ = 38950296. Its totient is φ = 10622640.

The previous prime is 21751291. The next prime is 21751337. The reversal of 21751292 is 29215712.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21751291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63059 + ... + 63402.

It is an arithmetic number, because the mean of its divisors is an integer number (3245858).

Almost surely, 2^21751292 is an apocalyptic number.

It is an amenable number.

21751292 is a deficient number, since it is larger than the sum of its proper divisors (17199004).

21751292 is a wasteful number, since it uses less digits than its factorization.

21751292 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126508 (or 126506 counting only the distinct ones).

The product of its digits is 2520, while the sum is 29.

The square root of 21751292 is about 4663.8280414269. The cubic root of 21751292 is about 279.1440356299.

The spelling of 21751292 in words is "twenty-one million, seven hundred fifty-one thousand, two hundred ninety-two".