21224756232 has 48 divisors (see below), whose sum is σ = 57897294000. Its totient is φ = 7024016736.

The previous prime is 21224756219. The next prime is 21224756233. The reversal of 21224756232 is 23265742212.

21224756232 is a `hidden beast` number, since 2 + 1 + 2 + 24 + 7 + 5 + 623 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (21224756233) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 1050382 + ... + 1070397.

It is an arithmetic number, because the mean of its divisors is an integer number (1206193625).

Almost surely, 2^21224756232 is an apocalyptic number.

It is an amenable number.

21224756232 is an abundant number, since it is smaller than the sum of its proper divisors (36672537768).

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

21224756232 is a wasteful number, since it uses less digits than its factorization.

21224756232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120930 (or 2120923 counting only the distinct ones).

The product of its digits is 80640, while the sum is 36.

The spelling of 21224756232 in words is "twenty-one billion, two hundred twenty-four million, seven hundred fifty-six thousand, two hundred thirty-two".