31945043221 has 8 divisors (see below), whose sum is σ = 39316976384. Its totient is φ = 25275198960.

The previous prime is 31945043209. The next prime is 31945043243. The reversal of 31945043221 is 12234054913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31945043221 - 2⁵ = 31945043189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31945043021) 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, 175522125 + ... + 175522306.

It is an arithmetic number, because the mean of its divisors is an integer number (4914622048).

Almost surely, 2^31945043221 is an apocalyptic number.

It is an amenable number.

31945043221 is a deficient number, since it is larger than the sum of its proper divisors (7371933163).

31945043221 is a wasteful number, since it uses less digits than its factorization.

31945043221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351044451.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 31945043221 in words is "thirty-one billion, nine hundred forty-five million, forty-three thousand, two hundred twenty-one".