31212120331021 has 8 divisors (see below), whose sum is σ = 35672357245824. Its totient is φ = 26752224061680.

The previous prime is 31212120330997. The next prime is 31212120331033. The reversal of 31212120331021 is 12013302121213.

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 31212120331021 - 2¹⁵ = 31212120298253 is a prime.

It is a super-2 number, since 2×31212120331021² (a number of 28 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 = 31212120330983 and 31212120331001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212120331421) 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, 84964990 + ... + 85331551.

It is an arithmetic number, because the mean of its divisors is an integer number (4459044655728).

Almost surely, 2^{31212120331021} is an apocalyptic number.

It is an amenable number.

31212120331021 is a deficient number, since it is larger than the sum of its proper divisors (4460236914803).

31212120331021 is a wasteful number, since it uses less digits than its factorization.

31212120331021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170322731.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31212120331021 its reverse (12013302121213), we get a palindrome (43225422452234).

The spelling of 31212120331021 in words is "thirty-one trillion, two hundred twelve billion, one hundred twenty million, three hundred thirty-one thousand, twenty-one".