31021312121030 has 512 divisors, whose sum is σ = 73055831040000. Its totient is φ = 9399323566080.

The previous prime is 31021312120961. The next prime is 31021312121081. The reversal of 31021312121030 is 3012121312013.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31021312120993 and 31021312121011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 86410339991 + ... + 86410340349.

It is an arithmetic number, because the mean of its divisors is an integer number (142687170000).

Almost surely, 2^{31021312121030} is an apocalyptic number.

31021312121030 is an abundant number, since it is smaller than the sum of its proper divisors (42034518918970).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31021312121030 is a wasteful number, since it uses less digits than its factorization.

31021312121030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 837 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31021312121030 its reverse (3012121312013), we get a palindrome (34033433433043).

The spelling of 31021312121030 in words is "thirty-one trillion, twenty-one billion, three hundred twelve million, one hundred twenty-one thousand, thirty".