21352536 has 24 divisors (see below), whose sum is σ = 57829980. Its totient is φ = 7117488.

The previous prime is 21352531. The next prime is 21352543. The reversal of 21352536 is 63525312.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21352531) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 148210 + ... + 148353.

Almost surely, 2^21352536 is an apocalyptic number.

It is an amenable number.

21352536 is an abundant number, since it is smaller than the sum of its proper divisors (36477444).

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

21352536 is a wasteful number, since it uses less digits than its factorization.

21352536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296575 (or 296568 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 21352536 is about 4620.8804355880. The cubic root of 21352536 is about 277.4276996937.

Adding to 21352536 its reverse (63525312), we get a palindrome (84877848).

It can be divided in two parts, 2 and 1352536, that multiplied together give a palindrome (2705072).

The spelling of 21352536 in words is "twenty-one million, three hundred fifty-two thousand, five hundred thirty-six".