31311312121201 has 4 divisors (see below), whose sum is σ = 35784356709952. Its totient is φ = 26838267532452.

The previous prime is 31311312121189. The next prime is 31311312121231. The reversal of 31311312121201 is 10212121311313.

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 31311312121201 - 2¹⁷ = 31311311990129 is a prime.

It is a super-2 number, since 2×31311312121201² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31311312121231) 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, 2236522294365 + ... + 2236522294378.

It is an arithmetic number, because the mean of its divisors is an integer number (8946089177488).

Almost surely, 2^{31311312121201} is an apocalyptic number.

It is an amenable number.

31311312121201 is a deficient number, since it is larger than the sum of its proper divisors (4473044588751).

31311312121201 is an equidigital number, since it uses as much as digits as its factorization.

31311312121201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4473044588750.

The product of its (nonzero) digits is 216, while the sum is 22.

Adding to 31311312121201 its reverse (10212121311313), we get a palindrome (41523433432514).

The spelling of 31311312121201 in words is "thirty-one trillion, three hundred eleven billion, three hundred twelve million, one hundred twenty-one thousand, two hundred one".