111010100020 has 24 divisors (see below), whose sum is σ = 233626915368. Its totient is φ = 44307715200.

The previous prime is 111010099999. The next prime is 111010100023. The reversal of 111010100020 is 20001010111.

It can be written as a sum of positive squares in 4 ways, for example, as 26982004644 + 84028095376 = 164262^2 + 289876^2 .

It is a junction number, because it is equal to n+sod(n) for n = 111010099976 and 111010100012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111010100023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6010851 + ... + 6029290.

It is an arithmetic number, because the mean of its divisors is an integer number (9734454807).

Almost surely, 2^111010100020 is an apocalyptic number.

111010100020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111010100020 is an abundant number, since it is smaller than the sum of its proper divisors (122616815348).

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

111010100020 is a wasteful number, since it uses less digits than its factorization.

111010100020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12040611 (or 12040609 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 111010100020 its reverse (20001010111), we get a palindrome (131011110131).

The spelling of 111010100020 in words is "one hundred eleven billion, ten million, one hundred thousand, twenty".