21376524 has 24 divisors (see below), whose sum is σ = 53715760. Its totient is φ = 6577344.

The previous prime is 21376519. The next prime is 21376559. The reversal of 21376524 is 42567312.

It is a junction number, because it is equal to n+sod(n) for n = 21376491 and 21376500.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68359 + ... + 68670.

Almost surely, 2^21376524 is an apocalyptic number.

It is an amenable number.

21376524 is an abundant number, since it is smaller than the sum of its proper divisors (32339236).

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

21376524 is a wasteful number, since it uses less digits than its factorization.

21376524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137049 (or 137047 counting only the distinct ones).

The product of its digits is 10080, while the sum is 30.

The square root of 21376524 is about 4623.4753162529. The cubic root of 21376524 is about 277.5315506696.

The spelling of 21376524 in words is "twenty-one million, three hundred seventy-six thousand, five hundred twenty-four".