210000102021 has 24 divisors (see below), whose sum is σ = 311558696280. Its totient is φ = 136204471296.

The previous prime is 210000102001. The next prime is 210000102049. The reversal of 210000102021 is 120201000012.

It can be written as a sum of positive squares in 4 ways, for example, as 143804016225 + 66196085796 = 379215^2 + 257286^2 .

It is not a de Polignac number, because 210000102021 - 2⁵ = 210000101989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 210000101994 and 210000102012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000102001) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5485081 + ... + 5523233.

It is an arithmetic number, because the mean of its divisors is an integer number (12981612345).

Almost surely, 2^210000102021 is an apocalyptic number.

It is an amenable number.

210000102021 is a deficient number, since it is larger than the sum of its proper divisors (101558594259).

210000102021 is a wasteful number, since it uses less digits than its factorization.

210000102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54725 (or 54722 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 210000102021 its reverse (120201000012), we get a palindrome (330201102033).

The spelling of 210000102021 in words is "two hundred ten billion, one hundred two thousand, twenty-one".