2100202121021 has 4 divisors (see below), whose sum is σ = 2135798767200. Its totient is φ = 2064605474844.

The previous prime is 2100202121009. The next prime is 2100202121033. The reversal of 2100202121021 is 1201212020012.

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 an interprime number because it is at equal distance from previous prime (2100202121009) and next prime (2100202121033).

It is a cyclic number.

It is not a de Polignac number, because 2100202121021 - 2⁶ = 2100202120957 is a prime.

It is a super-2 number, since 2×2100202121021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100202120987 and 2100202121005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100202121081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17798323001 + ... + 17798323118.

It is an arithmetic number, because the mean of its divisors is an integer number (533949691800).

Almost surely, 2^{2100202121021} is an apocalyptic number.

It is an amenable number.

2100202121021 is a deficient number, since it is larger than the sum of its proper divisors (35596646179).

2100202121021 is an equidigital number, since it uses as much as digits as its factorization.

2100202121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35596646178.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2100202121021 its reverse (1201212020012), we get a palindrome (3301414141033).

The spelling of 2100202121021 in words is "two trillion, one hundred billion, two hundred two million, one hundred twenty-one thousand, twenty-one".