21032120 has 32 divisors (see below), whose sum is σ = 49381920. Its totient is φ = 8046720.

The previous prime is 21032119. The next prime is 21032153. The reversal of 21032120 is 2123012.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10511 + ... + 12350.

It is an arithmetic number, because the mean of its divisors is an integer number (1543185).

Almost surely, 2^21032120 is an apocalyptic number.

21032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21032120 is an abundant number, since it is smaller than the sum of its proper divisors (28349800).

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

21032120 is a wasteful number, since it uses less digits than its factorization.

21032120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22895 (or 22891 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 21032120 is about 4586.0789352125. The cubic root of 21032120 is about 276.0330073246.

Adding to 21032120 its reverse (2123012), we get a palindrome (23155132).

The spelling of 21032120 in words is "twenty-one million, thirty-two thousand, one hundred twenty".