100000111020021 has 12 divisors (see below), whose sum is σ = 145064538735948. Its totient is φ = 66380617328064.

The previous prime is 100000111020013. The next prime is 100000111020023. The reversal of 100000111020021 is 120020111000001.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55404947902500 + 44595163117521 = 7443450^2 + 6677961^2 .

It is not a de Polignac number, because 100000111020021 - 2³ = 100000111020013 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 100000111019985 and 100000111020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100000111020023) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23843610450 + ... + 23843614643.

It is an arithmetic number, because the mean of its divisors is an integer number (12088711561329).

Almost surely, 2^{100000111020021} is an apocalyptic number.

It is an amenable number.

100000111020021 is a deficient number, since it is larger than the sum of its proper divisors (45064427715927).

100000111020021 is a wasteful number, since it uses less digits than its factorization.

100000111020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47687225332 (or 47687225329 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 100000111020021 its reverse (120020111000001), we get a palindrome (220020222020022).

The spelling of 100000111020021 in words is "one hundred trillion, one hundred eleven million, twenty thousand, twenty-one".