21152912 has 40 divisors (see below), whose sum is σ = 46163712. Its totient is φ = 9302400.

The previous prime is 21152869. The next prime is 21152917. The reversal of 21152912 is 21925112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3518 + ... + 7394.

Almost surely, 2^21152912 is an apocalyptic number.

21152912 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21152912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23081856).

21152912 is an abundant number, since it is smaller than the sum of its proper divisors (25010800).

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

21152912 is a wasteful number, since it uses less digits than its factorization.

21152912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3927 (or 3921 counting only the distinct ones).

The product of its digits is 360, while the sum is 23.

The square root of 21152912 is about 4599.2295006881. The cubic root of 21152912 is about 276.5604379197.

The spelling of 21152912 in words is "twenty-one million, one hundred fifty-two thousand, nine hundred twelve".