21488442 has 16 divisors (see below), whose sum is σ = 45505152. Its totient is φ = 6741440.

The previous prime is 21488431. The next prime is 21488477. The reversal of 21488442 is 24488412.

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, 105234 + ... + 105437.

It is an arithmetic number, because the mean of its divisors is an integer number (2844072).

Almost surely, 2^21488442 is an apocalyptic number.

21488442 is an abundant number, since it is smaller than the sum of its proper divisors (24016710).

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

21488442 is a wasteful number, since it uses less digits than its factorization.

21488442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210693.

The product of its digits is 16384, while the sum is 33.

The square root of 21488442 is about 4635.5627490090. The cubic root of 21488442 is about 278.0150518911.

The spelling of 21488442 in words is "twenty-one million, four hundred eighty-eight thousand, four hundred forty-two".