31111212230020 has 48 divisors (see below), whose sum is σ = 71686735207920. Its totient is φ = 11270476878336.

The previous prime is 31111212229939. The next prime is 31111212230071. The reversal of 31111212230020 is 2003221211113.

It can be written as a sum of positive squares in 8 ways, for example, as 392637585664 + 30718574644356 = 626608^2 + 5542434^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31111212230020.

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 15 ways as a sum of consecutive naturals, for example, 1128840075 + ... + 1128867634.

It is an arithmetic number, because the mean of its divisors is an integer number (1493473650165).

Almost surely, 2^{31111212230020} is an apocalyptic number.

It is an amenable number.

31111212230020 is an abundant number, since it is smaller than the sum of its proper divisors (40575522977900).

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

31111212230020 is a wasteful number, since it uses less digits than its factorization.

31111212230020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257707784 (or 2257707782 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 31111212230020 its reverse (2003221211113), we get a palindrome (33114433441133).

The spelling of 31111212230020 in words is "thirty-one trillion, one hundred eleven billion, two hundred twelve million, two hundred thirty thousand, twenty".