31111201313220 has 144 divisors (see below), whose sum is σ = 101336558319360. Its totient is φ = 7110926032896.

The previous prime is 31111201313201. The next prime is 31111201313237. The reversal of 31111201313220 is 2231310211113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 116664196 + ... + 116930564.

It is an arithmetic number, because the mean of its divisors is an integer number (703726099440).

Almost surely, 2^{31111201313220} is an apocalyptic number.

31111201313220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31111201313220 is an abundant number, since it is smaller than the sum of its proper divisors (70225357006140).

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

31111201313220 is a wasteful number, since it uses less digits than its factorization.

31111201313220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306122 (or 306113 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 21.

Adding to 31111201313220 its reverse (2231310211113), we get a palindrome (33342511524333).

The spelling of 31111201313220 in words is "thirty-one trillion, one hundred eleven billion, two hundred one million, three hundred thirteen thousand, two hundred twenty".