100010121021 has 24 divisors (see below), whose sum is σ = 146334680960. Its totient is φ = 65808288000.

The previous prime is 100010120999. The next prime is 100010121031. The reversal of 100010121021 is 120121010001.

It is a happy number.

It is not a de Polignac number, because 100010121021 - 2⁵ = 100010120989 is a prime.

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

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100010120994 and 100010121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100010121031) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 2368746 + ... + 2410596.

Almost surely, 2^100010121021 is an apocalyptic number.

It is an amenable number.

100010121021 is a deficient number, since it is larger than the sum of its proper divisors (46324559939).

100010121021 is a wasteful number, since it uses less digits than its factorization.

100010121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45297 (or 45294 counting only the distinct ones).

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

Adding to 100010121021 its reverse (120121010001), we get a palindrome (220131131022).

The spelling of 100010121021 in words is "one hundred billion, ten million, one hundred twenty-one thousand, twenty-one".