21532642 has 16 divisors (see below), whose sum is σ = 34556760. Its totient is φ = 10027008.

The previous prime is 21532633. The next prime is 21532663. The reversal of 21532642 is 24623512.

It can be written as a sum of positive squares in 4 ways, for example, as 16329681 + 5202961 = 4041^2 + 2281^2 .

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, 34 + ... + 6562.

Almost surely, 2^21532642 is an apocalyptic number.

21532642 is a deficient number, since it is larger than the sum of its proper divisors (13024118).

21532642 is a wasteful number, since it uses less digits than its factorization.

21532642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6645.

The product of its digits is 2880, while the sum is 25.

The square root of 21532642 is about 4640.3277901459. The cubic root of 21532642 is about 278.2055395585.

It can be divided in two parts, 2 and 1532642, that added together give a square (1532644 = 1238²).

The spelling of 21532642 in words is "twenty-one million, five hundred thirty-two thousand, six hundred forty-two".