31023131331220 has 48 divisors (see below), whose sum is σ = 74456033678208. Its totient is φ = 10636428101760.

The previous prime is 31023131331173. The next prime is 31023131331223. The reversal of 31023131331220 is 2213313132013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31023131331223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21742590 + ... + 23125450.

It is an arithmetic number, because the mean of its divisors is an integer number (1551167368296).

Almost surely, 2^{31023131331220} is an apocalyptic number.

It is an amenable number.

31023131331220 is an abundant number, since it is smaller than the sum of its proper divisors (43432902346988).

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

31023131331220 is a wasteful number, since it uses less digits than its factorization.

31023131331220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543120 (or 1543118 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 25.

Adding to 31023131331220 its reverse (2213313132013), we get a palindrome (33236444463233).

The spelling of 31023131331220 in words is "thirty-one trillion, twenty-three billion, one hundred thirty-one million, three hundred thirty-one thousand, two hundred twenty".