21162536 has 16 divisors (see below), whose sum is σ = 40603200. Its totient is φ = 10335024.

The previous prime is 21162521. The next prime is 21162539. The reversal of 21162536 is 63526112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21162539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30416 + ... + 31103.

It is an arithmetic number, because the mean of its divisors is an integer number (2537700).

Almost surely, 2^21162536 is an apocalyptic number.

It is an amenable number.

21162536 is a deficient number, since it is larger than the sum of its proper divisors (19440664).

21162536 is a wasteful number, since it uses less digits than its factorization.

21162536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61568 (or 61564 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 21162536 is about 4600.2756439153. The cubic root of 21162536 is about 276.6023740544.

Adding to 21162536 its reverse (63526112), we get a palindrome (84688648).

The spelling of 21162536 in words is "twenty-one million, one hundred sixty-two thousand, five hundred thirty-six".