111312100021020 has 96 divisors (see below), whose sum is σ = 313449139584000. Its totient is φ = 29514190389504.

The previous prime is 111312100020983. The next prime is 111312100021027. The reversal of 111312100021020 is 20120001213111.

It is a super-2 number, since 2×111312100021020² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111312100021027) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99076381 + ... + 100193579.

It is an arithmetic number, because the mean of its divisors is an integer number (3265095204000).

Almost surely, 2^{111312100021020} is an apocalyptic number.

111312100021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111312100021020 is an abundant number, since it is smaller than the sum of its proper divisors (202137039562980).

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

111312100021020 is a wasteful number, since it uses less digits than its factorization.

111312100021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126667 (or 1126665 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 111312100021020 its reverse (20120001213111), we get a palindrome (131432101234131).

The spelling of 111312100021020 in words is "one hundred eleven trillion, three hundred twelve billion, one hundred million, twenty-one thousand, twenty".