31211311113020 has 24 divisors (see below), whose sum is σ = 65543932301568. Its totient is φ = 12484490356800.

The previous prime is 31211311113013. The next prime is 31211311113061. The reversal of 31211311113020 is 2031111311213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 31211311112983 and 31211311113001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6165230 + ... + 10021610.

It is an arithmetic number, because the mean of its divisors is an integer number (2730997179232).

Almost surely, 2^{31211311113020} is an apocalyptic number.

It is an amenable number.

31211311113020 is an abundant number, since it is smaller than the sum of its proper divisors (34332621188548).

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

31211311113020 is a wasteful number, since it uses less digits than its factorization.

31211311113020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4261061 (or 4261059 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

Adding to 31211311113020 its reverse (2031111311213), we get a palindrome (33242422424233).

The spelling of 31211311113020 in words is "thirty-one trillion, two hundred eleven billion, three hundred eleven million, one hundred thirteen thousand, twenty".