210102110021 has 8 divisors (see below), whose sum is σ = 211774402560. Its totient is φ = 208430098128.

The previous prime is 210102109979. The next prime is 210102110077. The reversal of 210102110021 is 120011201012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 210102110021 - 2³⁴ = 192922240837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210102109984 and 210102110011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102112021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1588295 + ... + 1715483.

It is an arithmetic number, because the mean of its divisors is an integer number (26471800320).

Almost surely, 2^210102110021 is an apocalyptic number.

It is an amenable number.

210102110021 is a deficient number, since it is larger than the sum of its proper divisors (1672292539).

210102110021 is a wasteful number, since it uses less digits than its factorization.

210102110021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140323.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 210102110021 its reverse (120011201012), we get a palindrome (330113311033).

Subtracting from 210102110021 its reverse (120011201012), we obtain a palindrome (90090909009).

The spelling of 210102110021 in words is "two hundred ten billion, one hundred two million, one hundred ten thousand, twenty-one".