21223552120 has 16 divisors (see below), whose sum is σ = 47752992360. Its totient is φ = 8489420832.

The previous prime is 21223552093. The next prime is 21223552123. The reversal of 21223552120 is 2125532212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223552123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 265294362 + ... + 265294441.

Almost surely, 2^21223552120 is an apocalyptic number.

21223552120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21223552120 is an abundant number, since it is smaller than the sum of its proper divisors (26529440240).

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

21223552120 is a wasteful number, since it uses less digits than its factorization.

21223552120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530588814 (or 530588810 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The spelling of 21223552120 in words is "twenty-one billion, two hundred twenty-three million, five hundred fifty-two thousand, one hundred twenty".