31221303413 has 4 divisors (see below), whose sum is σ = 31345691328. Its totient is φ = 31096915500.

The previous prime is 31221303391. The next prime is 31221303419. The reversal of 31221303413 is 31430312213.

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, and also an emirpimes, since its reverse is a distinct semiprime: 31430312213 = 151 ⋅208147763.

It is a cyclic number.

It is not a de Polignac number, because 31221303413 - 2²⁰ = 31220254837 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 (31221303419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62193581 + ... + 62194082.

It is an arithmetic number, because the mean of its divisors is an integer number (7836422832).

Almost surely, 2^31221303413 is an apocalyptic number.

It is an amenable number.

31221303413 is a deficient number, since it is larger than the sum of its proper divisors (124387915).

31221303413 is a wasteful number, since it uses less digits than its factorization.

31221303413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124387914.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 31221303413 its reverse (31430312213), we get a palindrome (62651615626).

The spelling of 31221303413 in words is "thirty-one billion, two hundred twenty-one million, three hundred three thousand, four hundred thirteen".