31333012221221 has 4 divisors (see below), whose sum is σ = 31414821652992. Its totient is φ = 31251202789452.

The previous prime is 31333012221197. The next prime is 31333012221229. The reversal of 31333012221221 is 12212221033313.

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 not a de Polignac number, because 31333012221221 - 2³⁴ = 31315832352037 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 (31333012221229) 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, 40904715311 + ... + 40904716076.

It is an arithmetic number, because the mean of its divisors is an integer number (7853705413248).

Almost surely, 2^{31333012221221} is an apocalyptic number.

It is an amenable number.

31333012221221 is a deficient number, since it is larger than the sum of its proper divisors (81809431771).

31333012221221 is an equidigital number, since it uses as much as digits as its factorization.

31333012221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81809431770.

The product of its (nonzero) digits is 2592, while the sum is 26.

Adding to 31333012221221 its reverse (12212221033313), we get a palindrome (43545233254534).

The spelling of 31333012221221 in words is "thirty-one trillion, three hundred thirty-three billion, twelve million, two hundred twenty-one thousand, two hundred twenty-one".