21159196 has 24 divisors (see below), whose sum is σ = 37818144. Its totient is φ = 10356480.

The previous prime is 21159181. The next prime is 21159211. The reversal of 21159196 is 69195112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21159181) and next prime (21159211).

It is a congruent number.

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, 67881 + ... + 68191.

It is an arithmetic number, because the mean of its divisors is an integer number (1575756).

Almost surely, 2^21159196 is an apocalyptic number.

It is an amenable number.

21159196 is a deficient number, since it is larger than the sum of its proper divisors (16658948).

21159196 is a wasteful number, since it uses less digits than its factorization.

21159196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 619 counting only the distinct ones).

The product of its digits is 4860, while the sum is 34.

The square root of 21159196 is about 4599.9126078655. The cubic root of 21159196 is about 276.5878215997.

It can be divided in two parts, 2115 and 9196, that added together give a palindrome (11311).

The spelling of 21159196 in words is "twenty-one million, one hundred fifty-nine thousand, one hundred ninety-six".