31313221202142 has 96 divisors (see below), whose sum is σ = 74542302971136. Its totient is φ = 9421070256000.

The previous prime is 31313221202117. The next prime is 31313221202183. The reversal of 31313221202142 is 24120212231313.

31313221202142 is a `hidden beast` number, since 3 + 1 + 3 + 1 + 322 + 120 + 214 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56921133 + ... + 57468615.

It is an arithmetic number, because the mean of its divisors is an integer number (776482322616).

Almost surely, 2^{31313221202142} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31313221202142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37271151485568).

31313221202142 is an abundant number, since it is smaller than the sum of its proper divisors (43229081768994).

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

31313221202142 is a wasteful number, since it uses less digits than its factorization.

31313221202142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549566 (or 549563 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

Adding to 31313221202142 its reverse (24120212231313), we get a palindrome (55433433433455).

The spelling of 31313221202142 in words is "thirty-one trillion, three hundred thirteen billion, two hundred twenty-one million, two hundred two thousand, one hundred forty-two".