31301113101221 has 4 divisors (see below), whose sum is σ = 31301363061792. Its totient is φ = 31300863140652.

The previous prime is 31301113101173. The next prime is 31301113101239. The reversal of 31301113101221 is 12210131110313.

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 31301113101221 - 2¹⁸ = 31301112839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31301113101193 and 31301113101202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31301113101281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124792355 + ... + 125042928.

It is an arithmetic number, because the mean of its divisors is an integer number (7825340765448).

Almost surely, 2^{31301113101221} is an apocalyptic number.

It is an amenable number.

31301113101221 is a deficient number, since it is larger than the sum of its proper divisors (249960571).

31301113101221 is a wasteful number, since it uses less digits than its factorization.

31301113101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249960570.

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31301113101221 its reverse (12210131110313), we get a palindrome (43511244211534).

The spelling of 31301113101221 in words is "thirty-one trillion, three hundred one billion, one hundred thirteen million, one hundred one thousand, two hundred twenty-one".