102110200021 has 4 divisors (see below), whose sum is σ = 102914217472. Its totient is φ = 101306182572.

The previous prime is 102110200019. The next prime is 102110200033. The reversal of 102110200021 is 120002011201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 120002011201 = 79979 ⋅1500419.

It is a cyclic number.

It is not a de Polignac number, because 102110200021 - 2¹ = 102110200019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102110199980 and 102110200007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102110200061) 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, 402008535 + ... + 402008788.

It is an arithmetic number, because the mean of its divisors is an integer number (25728554368).

Almost surely, 2^102110200021 is an apocalyptic number.

It is an amenable number.

102110200021 is a deficient number, since it is larger than the sum of its proper divisors (804017451).

102110200021 is an equidigital number, since it uses as much as digits as its factorization.

102110200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804017450.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 102110200021 its reverse (120002011201), we get a palindrome (222112211222).

The spelling of 102110200021 in words is "one hundred two billion, one hundred ten million, two hundred thousand, twenty-one".