202102101130021 has 4 divisors (see below), whose sum is σ = 202106438969344. Its totient is φ = 202097763290700.

The previous prime is 202102101129989. The next prime is 202102101130043. The reversal of 202102101130021 is 120031101201202.

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 202102101130021 - 2⁵ = 202102101129989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 202102101129977 and 202102101130004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202102101130621) 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, 2168849775 + ... + 2168942956.

It is an arithmetic number, because the mean of its divisors is an integer number (50526609742336).

Almost surely, 2^{202102101130021} is an apocalyptic number.

It is an amenable number.

202102101130021 is a deficient number, since it is larger than the sum of its proper divisors (4337839323).

202102101130021 is an equidigital number, since it uses as much as digits as its factorization.

202102101130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337839322.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 202102101130021 its reverse (120031101201202), we get a palindrome (322133202331223).

The spelling of 202102101130021 in words is "two hundred two trillion, one hundred two billion, one hundred one million, one hundred thirty thousand, twenty-one".