21152120 has 32 divisors (see below), whose sum is σ = 51919920. Its totient is φ = 7691520.

The previous prime is 21152099. The next prime is 21152143. The reversal of 21152120 is 2125112.

It is a junction number, because it is equal to n+sod(n) for n = 21152095 and 21152104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23597 + ... + 24476.

Almost surely, 2^21152120 is an apocalyptic number.

21152120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21152120 is an abundant number, since it is smaller than the sum of its proper divisors (30767800).

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

21152120 is a wasteful number, since it uses less digits than its factorization.

21152120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48095 (or 48091 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21152120 is about 4599.1433985037. The cubic root of 21152120 is about 276.5569862499.

Adding to 21152120 its reverse (2125112), we get a palindrome (23277232).

The spelling of 21152120 in words is "twenty-one million, one hundred fifty-two thousand, one hundred twenty".