21532436 has 12 divisors (see below), whose sum is σ = 37765728. Its totient is φ = 10742232.

The previous prime is 21532417. The next prime is 21532499. The reversal of 21532436 is 63423512.

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, 3896 + ... + 7631.

It is an arithmetic number, because the mean of its divisors is an integer number (3147144).

Almost surely, 2^21532436 is an apocalyptic number.

It is an amenable number.

21532436 is a deficient number, since it is larger than the sum of its proper divisors (16233292).

21532436 is a wasteful number, since it uses less digits than its factorization.

21532436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11998 (or 11996 counting only the distinct ones).

The product of its digits is 4320, while the sum is 26.

The square root of 21532436 is about 4640.3055933850. The cubic root of 21532436 is about 278.2046523702.

Adding to 21532436 its reverse (63423512), we get a palindrome (84955948).

The spelling of 21532436 in words is "twenty-one million, five hundred thirty-two thousand, four hundred thirty-six".