1021100000121 has 10 divisors (see below), whose sum is σ = 1525346913882. Its totient is φ = 680733333360.

The previous prime is 1021100000057. The next prime is 1021100000171. The reversal of 1021100000121 is 1210000011201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 539290484496 + 481809515625 = 734364^2 + 694125^2 .

It is not a de Polignac number, because 1021100000121 - 2⁶ = 1021100000057 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (1021100000171) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 6303086340 + ... + 6303086501.

Almost surely, 2^{1021100000121} is an apocalyptic number.

It is an amenable number.

1021100000121 is a deficient number, since it is larger than the sum of its proper divisors (504246913761).

1021100000121 is an equidigital number, since it uses as much as digits as its factorization.

1021100000121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12606172853 (or 12606172844 counting only the distinct ones).

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

Adding to 1021100000121 its reverse (1210000011201), we get a palindrome (2231100011322).

The spelling of 1021100000121 in words is "one trillion, twenty-one billion, one hundred million, one hundred twenty-one", and thus it is an aban number.