31220123120121 has 16 divisors (see below), whose sum is σ = 44898830645760. Its totient is φ = 19182410926080.

The previous prime is 31220123120113. The next prime is 31220123120143. The reversal of 31220123120121 is 12102132102213.

It is not a de Polignac number, because 31220123120121 - 2³ = 31220123120113 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31220123120621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 624402441 + ... + 624452438.

It is an arithmetic number, because the mean of its divisors is an integer number (2806176915360).

Almost surely, 2^{31220123120121} is an apocalyptic number.

It is an amenable number.

31220123120121 is a deficient number, since it is larger than the sum of its proper divisors (13678707525639).

31220123120121 is a wasteful number, since it uses less digits than its factorization.

31220123120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1248855536.

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 31220123120121 its reverse (12102132102213), we get a palindrome (43322255222334).

The spelling of 31220123120121 in words is "thirty-one trillion, two hundred twenty billion, one hundred twenty-three million, one hundred twenty thousand, one hundred twenty-one".