31231433221055 has 4 divisors (see below), whose sum is σ = 37477719865272. Its totient is φ = 24985146576840.

The previous prime is 31231433221049. The next prime is 31231433221057. The reversal of 31231433221055 is 55012233413213.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 31231433221055 - 2²⁸ = 31231164785599 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 (31231433221057) 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, 3123143322101 + ... + 3123143322110.

It is an arithmetic number, because the mean of its divisors is an integer number (9369429966318).

Almost surely, 2^{31231433221055} is an apocalyptic number.

31231433221055 is a deficient number, since it is larger than the sum of its proper divisors (6246286644217).

31231433221055 is an equidigital number, since it uses as much as digits as its factorization.

31231433221055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6246286644216.

The product of its (nonzero) digits is 64800, while the sum is 35.

Adding to 31231433221055 its reverse (55012233413213), we get a palindrome (86243666634268).

The spelling of 31231433221055 in words is "thirty-one trillion, two hundred thirty-one billion, four hundred thirty-three million, two hundred twenty-one thousand, fifty-five".