21542492 has 12 divisors (see below), whose sum is σ = 38073336. Its totient is φ = 10664400.

The previous prime is 21542483. The next prime is 21542537. The reversal of 21542492 is 29424512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26258 + ... + 27065.

It is an arithmetic number, because the mean of its divisors is an integer number (3172778).

Almost surely, 2^21542492 is an apocalyptic number.

It is an amenable number.

21542492 is a deficient number, since it is larger than the sum of its proper divisors (16530844).

21542492 is a wasteful number, since it uses less digits than its factorization.

21542492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53428 (or 53426 counting only the distinct ones).

The product of its digits is 5760, while the sum is 29.

The square root of 21542492 is about 4641.3890162321. The cubic root of 21542492 is about 278.2479543386.

The spelling of 21542492 in words is "twenty-one million, five hundred forty-two thousand, four hundred ninety-two".