31301211220121 has 4 divisors (see below), whose sum is σ = 31301285683200. Its totient is φ = 31301136757044.

The previous prime is 31301211220099. The next prime is 31301211220133. The reversal of 31301211220121 is 12102211210313.

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 31301211220121 - 2⁴² = 26903164709017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31301211220093 and 31301211220102.

It is not an unprimeable number, because it can be changed into a prime (31301211220151) 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, 36597401 + ... + 37442918.

It is an arithmetic number, because the mean of its divisors is an integer number (7825321420800).

Almost surely, 2^{31301211220121} is an apocalyptic number.

It is an amenable number.

31301211220121 is a deficient number, since it is larger than the sum of its proper divisors (74463079).

31301211220121 is an equidigital number, since it uses as much as digits as its factorization.

31301211220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74463078.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 31301211220121 its reverse (12102211210313), we get a palindrome (43403422430434).

The spelling of 31301211220121 in words is "thirty-one trillion, three hundred one billion, two hundred eleven million, two hundred twenty thousand, one hundred twenty-one".