210101121021 has 12 divisors (see below), whose sum is σ = 307916794976. Its totient is φ = 127334012520.

The previous prime is 210101120993. The next prime is 210101121071. The reversal of 210101121021 is 120121101012.

It is not a de Polignac number, because 210101121021 - 2⁷ = 210101120893 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210101120988 and 210101121006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210101121071) 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, 289395121 + ... + 289395846.

Almost surely, 2^210101121021 is an apocalyptic number.

It is an amenable number.

210101121021 is a deficient number, since it is larger than the sum of its proper divisors (97815673955).

210101121021 is a wasteful number, since it uses less digits than its factorization.

210101121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 578790992 (or 578790981 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 210101121021 its reverse (120121101012), we get a palindrome (330222222033).

The spelling of 210101121021 in words is "two hundred ten billion, one hundred one million, one hundred twenty-one thousand, twenty-one".