23202121021 has 4 divisors (see below), whose sum is σ = 23462819100. Its totient is φ = 22941422944.

The previous prime is 23202121009. The next prime is 23202121043. The reversal of 23202121021 is 12012120232.

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 11878820100 + 11323300921 = 108990^2 + 106411^2 .

It is a cyclic number.

It is not a de Polignac number, because 23202121021 - 2²⁷ = 23067903293 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23202120986 and 23202121004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23202121091) 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 3 ways as a sum of consecutive naturals, for example, 130348906 + ... + 130349083.

It is an arithmetic number, because the mean of its divisors is an integer number (5865704775).

Almost surely, 2^23202121021 is an apocalyptic number.

It is an amenable number.

23202121021 is a deficient number, since it is larger than the sum of its proper divisors (260698079).

23202121021 is an equidigital number, since it uses as much as digits as its factorization.

23202121021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260698078.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 23202121021 its reverse (12012120232), we get a palindrome (35214241253).

The spelling of 23202121021 in words is "twenty-three billion, two hundred two million, one hundred twenty-one thousand, twenty-one".