31002442121021 has 6 divisors (see below), whose sum is σ = 36064065324510. Its totient is φ = 26573521817976.

The previous prime is 31002442121011. The next prime is 31002442121093. The reversal of 31002442121021 is 12012124420013.

It can be written as a sum of positive squares in only one way, i.e., 30925221492025 + 77220628996 = 5561045^2 + 277886^2 .

It is not a de Polignac number, because 31002442121021 - 2⁶ = 31002442120957 is a prime.

It is a super-2 number, since 2×31002442121021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31002442121011) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 316351450166 + ... + 316351450263.

It is an arithmetic number, because the mean of its divisors is an integer number (6010677554085).

Almost surely, 2^{31002442121021} is an apocalyptic number.

It is an amenable number.

31002442121021 is a deficient number, since it is larger than the sum of its proper divisors (5061623203489).

31002442121021 is an equidigital number, since it uses as much as digits as its factorization.

31002442121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632702900443 (or 632702900436 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 31002442121021 its reverse (12012124420013), we get a palindrome (43014566541034).

The spelling of 31002442121021 in words is "thirty-one trillion, two billion, four hundred forty-two million, one hundred twenty-one thousand, twenty-one".