31220120201 has 32 divisors (see below), whose sum is σ = 33509203200. Its totient is φ = 29034028800.

The previous prime is 31220120177. The next prime is 31220120207. The reversal of 31220120201 is 10202102213.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 31220120201 - 2¹⁸ = 31219858057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31220120207) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61335935 + ... + 61336443.

It is an arithmetic number, because the mean of its divisors is an integer number (1047162600).

Almost surely, 2^31220120201 is an apocalyptic number.

It is an amenable number.

31220120201 is a deficient number, since it is larger than the sum of its proper divisors (2289082999).

31220120201 is a wasteful number, since it uses less digits than its factorization.

31220120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 31220120201 its reverse (10202102213), we get a palindrome (41422222414).

The spelling of 31220120201 in words is "thirty-one billion, two hundred twenty million, one hundred twenty thousand, two hundred one".