31103321232220 has 48 divisors (see below), whose sum is σ = 65453098991616. Its totient is φ = 12415402440000.

The previous prime is 31103321232197. The next prime is 31103321232229. The reversal of 31103321232220 is 2223212330113.

It is a super-2 number, since 2×31103321232220² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31103321232229) 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, 250063045 + ... + 250187395.

It is an arithmetic number, because the mean of its divisors is an integer number (1363606228992).

Almost surely, 2^{31103321232220} is an apocalyptic number.

It is an amenable number.

31103321232220 is an abundant number, since it is smaller than the sum of its proper divisors (34349777759396).

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

31103321232220 is a wasteful number, since it uses less digits than its factorization.

31103321232220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150322 (or 150320 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 31103321232220 its reverse (2223212330113), we get a palindrome (33326533562333).

The spelling of 31103321232220 in words is "thirty-one trillion, one hundred three billion, three hundred twenty-one million, two hundred thirty-two thousand, two hundred twenty".