21224032120 has 32 divisors (see below), whose sum is σ = 48918809520. Its totient is φ = 8282548480.

The previous prime is 21224032111. The next prime is 21224032121. The reversal of 21224032120 is 2123042212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224032121) 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, 6469102 + ... + 6472381.

Almost surely, 2^21224032120 is an apocalyptic number.

21224032120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21224032120 is an abundant number, since it is smaller than the sum of its proper divisors (27694777400).

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

21224032120 is a wasteful number, since it uses less digits than its factorization.

21224032120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12941535 (or 12941531 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

Adding to 21224032120 its reverse (2123042212), we get a palindrome (23347074332).

The spelling of 21224032120 in words is "twenty-one billion, two hundred twenty-four million, thirty-two thousand, one hundred twenty".