22304340021 has 4 divisors (see below), whose sum is σ = 29739120032. Its totient is φ = 14869560012.

The previous prime is 22304340007. The next prime is 22304340029. The reversal of 22304340021 is 12004340322.

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.

It is not a de Polignac number, because 22304340021 - 2⁹ = 22304339509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22304340021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22304340029) 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, 3717390001 + ... + 3717390006.

It is an arithmetic number, because the mean of its divisors is an integer number (7434780008).

Almost surely, 2^22304340021 is an apocalyptic number.

It is an amenable number.

22304340021 is a deficient number, since it is larger than the sum of its proper divisors (7434780011).

22304340021 is an equidigital number, since it uses as much as digits as its factorization.

22304340021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7434780010.

The product of its (nonzero) digits is 1152, while the sum is 21.

Adding to 22304340021 its reverse (12004340322), we get a palindrome (34308680343).

The spelling of 22304340021 in words is "twenty-two billion, three hundred four million, three hundred forty thousand, twenty-one".