20210210102021 has 4 divisors (see below), whose sum is σ = 20219367426432. Its totient is φ = 20201052777612.

The previous prime is 20210210102011. The next prime is 20210210102023. The reversal of 20210210102021 is 12020101201202.

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 20210210102021 - 2¹⁸ = 20210209839877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20210210101987 and 20210210102005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20210210102023) 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, 4578658895 + ... + 4578663308.

It is an arithmetic number, because the mean of its divisors is an integer number (5054841856608).

Almost surely, 2^{20210210102021} is an apocalyptic number.

It is an amenable number.

20210210102021 is a deficient number, since it is larger than the sum of its proper divisors (9157324411).

20210210102021 is an equidigital number, since it uses as much as digits as its factorization.

20210210102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9157324410.

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

Adding to 20210210102021 its reverse (12020101201202), we get a palindrome (32230311303223).

The spelling of 20210210102021 in words is "twenty trillion, two hundred ten billion, two hundred ten million, one hundred two thousand, twenty-one".