21051196 has 6 divisors (see below), whose sum is σ = 36839600. Its totient is φ = 10525596.

The previous prime is 21051193. The next prime is 21051197. The reversal of 21051196 is 69115012.

It is a self number, because there is not a number n which added to its sum of digits gives 21051196.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631396 + ... + 2631403.

Almost surely, 2^21051196 is an apocalyptic number.

It is an amenable number.

21051196 is a deficient number, since it is larger than the sum of its proper divisors (15788404).

21051196 is a wasteful number, since it uses less digits than its factorization.

21051196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5262803 (or 5262801 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 21051196 is about 4588.1582361553. The cubic root of 21051196 is about 276.1164355048.

The spelling of 21051196 in words is "twenty-one million, fifty-one thousand, one hundred ninety-six".