21537484 has 6 divisors (see below), whose sum is σ = 37690604. Its totient is φ = 10768740.

The previous prime is 21537479. The next prime is 21537491. The reversal of 21537484 is 48473512.

21537484 = 17⁴ + 18⁴ + ... + 40⁴.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2692182 + ... + 2692189.

Almost surely, 2^21537484 is an apocalyptic number.

It is an amenable number.

21537484 is a deficient number, since it is larger than the sum of its proper divisors (16153120).

21537484 is a wasteful number, since it uses less digits than its factorization.

21537484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5384375 (or 5384373 counting only the distinct ones).

The product of its digits is 26880, while the sum is 34.

The square root of 21537484 is about 4640.8494912031. The cubic root of 21537484 is about 278.2263911609.

The spelling of 21537484 in words is "twenty-one million, five hundred thirty-seven thousand, four hundred eighty-four".