21152112 has 20 divisors (see below), whose sum is σ = 54643080. Its totient is φ = 7050688.

The previous prime is 21152099. The next prime is 21152143. The reversal of 21152112 is 21125112.

It is a junction number, because it is equal to n+sod(n) for n = 21152091 and 21152100.

It is a congruent number.

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, 220287 + ... + 220382.

It is an arithmetic number, because the mean of its divisors is an integer number (2732154).

Almost surely, 2^21152112 is an apocalyptic number.

It is an amenable number.

21152112 is an abundant number, since it is smaller than the sum of its proper divisors (33490968).

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

21152112 is a wasteful number, since it uses less digits than its factorization.

21152112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440680 (or 440674 counting only the distinct ones).

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

The square root of 21152112 is about 4599.1425287764. The cubic root of 21152112 is about 276.5569513841.

Adding to 21152112 its reverse (21125112), we get a palindrome (42277224).

Subtracting from 21152112 its reverse (21125112), we obtain a cube (27000 = 30³).

The spelling of 21152112 in words is "twenty-one million, one hundred fifty-two thousand, one hundred twelve".