31321220131 has 8 divisors (see below), whose sum is σ = 32170133024. Its totient is φ = 30472433280.

The previous prime is 31321220113. The next prime is 31321220137. The reversal of 31321220131 is 13102212313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31321220131 - 2¹¹ = 31321218083 is a prime.

It is a super-2 number, since 2×31321220131² (a number of 22 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 = 31321220099 and 31321220108.

It is not an unprimeable number, because it can be changed into a prime (31321220137) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 697546 + ... + 741088.

It is an arithmetic number, because the mean of its divisors is an integer number (4021266628).

Almost surely, 2^31321220131 is an apocalyptic number.

31321220131 is a deficient number, since it is larger than the sum of its proper divisors (848912893).

31321220131 is a wasteful number, since it uses less digits than its factorization.

31321220131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63021.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31321220131 its reverse (13102212313), we get a palindrome (44423432444).

The spelling of 31321220131 in words is "thirty-one billion, three hundred twenty-one million, two hundred twenty thousand, one hundred thirty-one".