210120001021 has 4 divisors (see below), whose sum is σ = 240137144032. Its totient is φ = 180102858012.

The previous prime is 210120000997. The next prime is 210120001057. The reversal of 210120001021 is 120100021012.

210120001021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 210120001021 - 2²⁵ = 210086446589 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120000989 and 210120001007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120031021) 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 3 ways as a sum of consecutive naturals, for example, 15008571495 + ... + 15008571508.

It is an arithmetic number, because the mean of its divisors is an integer number (60034286008).

Almost surely, 2^210120001021 is an apocalyptic number.

It is an amenable number.

210120001021 is a deficient number, since it is larger than the sum of its proper divisors (30017143011).

210120001021 is an equidigital number, since it uses as much as digits as its factorization.

210120001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30017143010.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 210120001021 its reverse (120100021012), we get a palindrome (330220022033).

The spelling of 210120001021 in words is "two hundred ten billion, one hundred twenty million, one thousand, twenty-one".