31311220210121 has 16 divisors (see below), whose sum is σ = 31806664243200. Its totient is φ = 30817298374800.

The previous prime is 31311220210117. The next prime is 31311220210211. The reversal of 31311220210121 is 12101202211313.

It is a cyclic number.

It is not a de Polignac number, because 31311220210121 - 2² = 31311220210117 is a prime.

It is a super-2 number, since 2×31311220210121² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31311220210093 and 31311220210102.

It is not an unprimeable number, because it can be changed into a prime (31313220210121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 537862706 + ... + 537920916.

It is an arithmetic number, because the mean of its divisors is an integer number (1987916515200).

Almost surely, 2^{31311220210121} is an apocalyptic number.

It is an amenable number.

31311220210121 is a deficient number, since it is larger than the sum of its proper divisors (495444033079).

31311220210121 is a wasteful number, since it uses less digits than its factorization.

31311220210121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71140.

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

Adding to 31311220210121 its reverse (12101202211313), we get a palindrome (43412422421434).

The spelling of 31311220210121 in words is "thirty-one trillion, three hundred eleven billion, two hundred twenty million, two hundred ten thousand, one hundred twenty-one".