210102210021 has 24 divisors (see below), whose sum is σ = 311378195520. Its totient is φ = 125903926720.

The previous prime is 210102209983. The next prime is 210102210023. The reversal of 210102210021 is 120012201012.

210102210021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 210102210021 - 2²⁷ = 209967992293 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 210102209979 and 210102210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102210023) 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 23 ways as a sum of consecutive naturals, for example, 3219345 + ... + 3283958.

It is an arithmetic number, because the mean of its divisors is an integer number (12974091480).

Almost surely, 2^210102210021 is an apocalyptic number.

It is an amenable number.

210102210021 is a deficient number, since it is larger than the sum of its proper divisors (101275985499).

210102210021 is a wasteful number, since it uses less digits than its factorization.

210102210021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6503417 (or 6503406 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 210102210021 its reverse (120012201012), we get a palindrome (330114411033).

Subtracting from 210102210021 its reverse (120012201012), we obtain a palindrome (90090009009).

The spelling of 210102210021 in words is "two hundred ten billion, one hundred two million, two hundred ten thousand, twenty-one".