31745423722221 has 48 divisors (see below), whose sum is σ = 53014088761920. Its totient is φ = 18091338370560.

The previous prime is 31745423722193. The next prime is 31745423722231. The reversal of 31745423722221 is 12222732454713.

31745423722221 is a `hidden beast` number, since 3 + 1 + 7 + 4 + 54 + 2 + 372 + 2 + 221 = 666.

It is not a de Polignac number, because 31745423722221 - 2⁶ = 31745423722157 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31745423722231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 6789211 + ... + 10468248.

It is an arithmetic number, because the mean of its divisors is an integer number (1104460182540).

Almost surely, 2^{31745423722221} is an apocalyptic number.

It is an amenable number.

31745423722221 is a deficient number, since it is larger than the sum of its proper divisors (21268665039699).

31745423722221 is a wasteful number, since it uses less digits than its factorization.

31745423722221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17258586 (or 17258583 counting only the distinct ones).

The product of its digits is 1128960, while the sum is 45.

The spelling of 31745423722221 in words is "thirty-one trillion, seven hundred forty-five billion, four hundred twenty-three million, seven hundred twenty-two thousand, two hundred twenty-one".