31320214002 has 128 divisors (see below), whose sum is σ = 88412497920. Its totient is φ = 7981571520.

The previous prime is 31320213983. The next prime is 31320214007. The reversal of 31320214002 is 20041202313.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (31320214007) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 149313 + ... + 291435.

It is an arithmetic number, because the mean of its divisors is an integer number (690722640).

Almost surely, 2^31320214002 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31320214002, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44206248960).

31320214002 is an abundant number, since it is smaller than the sum of its proper divisors (57092283918).

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

31320214002 is a wasteful number, since it uses less digits than its factorization.

31320214002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142205 (or 142199 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31320214002 its reverse (20041202313), we get a palindrome (51361416315).

The spelling of 31320214002 in words is "thirty-one billion, three hundred twenty million, two hundred fourteen thousand, two".