31032432221 has 4 divisors (see below), whose sum is σ = 35465636832. Its totient is φ = 26599227612.

The previous prime is 31032432173. The next prime is 31032432241. The reversal of 31032432221 is 12223423013.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31032432221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31032432241) 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, 2216602295 + ... + 2216602308.

It is an arithmetic number, because the mean of its divisors is an integer number (8866409208).

Almost surely, 2^31032432221 is an apocalyptic number.

It is an amenable number.

31032432221 is a deficient number, since it is larger than the sum of its proper divisors (4433204611).

31032432221 is an equidigital number, since it uses as much as digits as its factorization.

31032432221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4433204610.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 31032432221 its reverse (12223423013), we get a palindrome (43255855234).

The spelling of 31032432221 in words is "thirty-one billion, thirty-two million, four hundred thirty-two thousand, two hundred twenty-one".