2100202102021 has 4 divisors (see below), whose sum is σ = 2100339215200. Its totient is φ = 2100064988844.

The previous prime is 2100202101983. The next prime is 2100202102027. The reversal of 2100202102021 is 1202012020012.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 2100202102021 - 2¹¹ = 2100202099973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2100202101992 and 2100202102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100202102027) 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, 68533611 + ... + 68564248.

It is an arithmetic number, because the mean of its divisors is an integer number (525084803800).

Almost surely, 2^{2100202102021} is an apocalyptic number.

It is an amenable number.

2100202102021 is a deficient number, since it is larger than the sum of its proper divisors (137113179).

2100202102021 is a wasteful number, since it uses less digits than its factorization.

2100202102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137113178.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2100202102021 its reverse (1202012020012), we get a palindrome (3302214122033).

The spelling of 2100202102021 in words is "two trillion, one hundred billion, two hundred two million, one hundred two thousand, twenty-one".