21115052 has 12 divisors (see below), whose sum is σ = 42230160. Its totient is φ = 9049296.

The previous prime is 21115027. The next prime is 21115063. The reversal of 21115052 is 25051112.

21115052 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 21115052.

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, 377027 + ... + 377082.

It is an arithmetic number, because the mean of its divisors is an integer number (3519180).

Almost surely, 2^21115052 is an apocalyptic number.

It is an amenable number.

21115052 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21115052 is a wasteful number, since it uses less digits than its factorization.

21115052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754120 (or 754118 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 21115052 is about 4595.1117505454. Note that the first 3 decimals coincide. The cubic root of 21115052 is about 276.3953411672.

Adding to 21115052 its reverse (25051112), we get a palindrome (46166164).

The spelling of 21115052 in words is "twenty-one million, one hundred fifteen thousand, fifty-two".