21112152 has 16 divisors (see below), whose sum is σ = 52780440. Its totient is φ = 7037376.

The previous prime is 21112151. The next prime is 21112177. The reversal of 21112152 is 25121112.

It is a super-2 number, since 2×21112152² = 891445924142208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112151) 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, 439813 + ... + 439860.

Almost surely, 2^21112152 is an apocalyptic number.

It is an amenable number.

21112152 is an abundant number, since it is smaller than the sum of its proper divisors (31668288).

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

21112152 is a wasteful number, since it uses less digits than its factorization.

21112152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879682 (or 879678 counting only the distinct ones).

The product of its digits is 40, while the sum is 15.

The square root of 21112152 is about 4594.7961869924. The cubic root of 21112152 is about 276.3826869527.

Adding to 21112152 its reverse (25121112), we get a palindrome (46233264).

The spelling of 21112152 in words is "twenty-one million, one hundred twelve thousand, one hundred fifty-two".