220121312031 has 24 divisors (see below), whose sum is σ = 321154569216. Its totient is φ = 145270382400.

The previous prime is 220121311981. The next prime is 220121312077. The reversal of 220121312031 is 130213121022.

It is not a de Polignac number, because 220121312031 - 2²⁷ = 219987094303 is a prime.

It is a super-2 number, since 2×220121312031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 220121311995 and 220121312013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220121312231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6649186 + ... + 6682208.

It is an arithmetic number, because the mean of its divisors is an integer number (13381440384).

Almost surely, 2^220121312031 is an apocalyptic number.

220121312031 is a deficient number, since it is larger than the sum of its proper divisors (101033257185).

220121312031 is a wasteful number, since it uses less digits than its factorization.

220121312031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40463 (or 40460 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 220121312031 its reverse (130213121022), we get a palindrome (350334433053).

The spelling of 220121312031 in words is "two hundred twenty billion, one hundred twenty-one million, three hundred twelve thousand, thirty-one".