31031201023021 has 4 divisors (see below), whose sum is σ = 31143227019772. Its totient is φ = 30919175026272.

The previous prime is 31031201023019. The next prime is 31031201023027. The reversal of 31031201023021 is 12032010213013.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19532245420900 + 11498955602121 = 4419530^2 + 3391011^2 .

It is a cyclic number.

It is not a de Polignac number, because 31031201023021 - 2¹ = 31031201023019 is a prime.

It is a super-2 number, since 2×31031201023021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31031201023021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31031201023027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56012997960 + ... + 56012998513.

It is an arithmetic number, because the mean of its divisors is an integer number (7785806754943).

Almost surely, 2^{31031201023021} is an apocalyptic number.

It is an amenable number.

31031201023021 is a deficient number, since it is larger than the sum of its proper divisors (112025996751).

31031201023021 is a wasteful number, since it uses less digits than its factorization.

31031201023021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112025996750.

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

Adding to 31031201023021 its reverse (12032010213013), we get a palindrome (43063211236034).

The spelling of 31031201023021 in words is "thirty-one trillion, thirty-one billion, two hundred one million, twenty-three thousand, twenty-one".