81111110220012 has 96 divisors (see below), whose sum is σ = 195955912341504. Its totient is φ = 26085682022400.

The previous prime is 81111110219989. The next prime is 81111110220031. The reversal of 81111110220012 is 21002201111118.

It is a super-2 number, since 2×81111110220012² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 707341962 + ... + 707456622.

It is an arithmetic number, because the mean of its divisors is an integer number (2041207420224).

Almost surely, 2^{81111110220012} is an apocalyptic number.

It is an amenable number.

81111110220012 is an abundant number, since it is smaller than the sum of its proper divisors (114844802121492).

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

81111110220012 is a wasteful number, since it uses less digits than its factorization.

81111110220012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120439 (or 120437 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 21.

The spelling of 81111110220012 in words is "eighty-one trillion, one hundred eleven billion, one hundred ten million, two hundred twenty thousand, twelve".