22102102021 has 4 divisors (see below), whose sum is σ = 22864243500. Its totient is φ = 21339960544.

The previous prime is 22102102003. The next prime is 22102102049. The reversal of 22102102021 is 12020120122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16342809921 + 5759292100 = 127839^2 + 75890^2 .

It is a cyclic number.

It is not a de Polignac number, because 22102102021 - 2⁹ = 22102101509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 22102101992 and 22102102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22102102091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 381070696 + ... + 381070753.

It is an arithmetic number, because the mean of its divisors is an integer number (5716060875).

Almost surely, 2^22102102021 is an apocalyptic number.

It is an amenable number.

22102102021 is a deficient number, since it is larger than the sum of its proper divisors (762141479).

22102102021 is an equidigital number, since it uses as much as digits as its factorization.

22102102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762141478.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22102102021 its reverse (12020120122), we get a palindrome (34122222143).

The spelling of 22102102021 in words is "twenty-two billion, one hundred two million, one hundred two thousand, twenty-one".