31020331121 has 16 divisors (see below), whose sum is σ = 33524434944. Its totient is φ = 28533207744.

The previous prime is 31020331079. The next prime is 31020331123. The reversal of 31020331121 is 12113302013.

It is a cyclic number.

It is not a de Polignac number, because 31020331121 - 2¹⁸ = 31020068977 is a prime.

It is a super-2 number, since 2×31020331121² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31020331121.

It is not an unprimeable number, because it can be changed into a prime (31020331123) 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, 9793280 + ... + 9796446.

It is an arithmetic number, because the mean of its divisors is an integer number (2095277184).

Almost surely, 2^31020331121 is an apocalyptic number.

It is an amenable number.

31020331121 is a deficient number, since it is larger than the sum of its proper divisors (2504103823).

31020331121 is a wasteful number, since it uses less digits than its factorization.

31020331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5600.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31020331121 its reverse (12113302013), we get a palindrome (43133633134).

The spelling of 31020331121 in words is "thirty-one billion, twenty million, three hundred thirty-one thousand, one hundred twenty-one".