21423022315 has 4 divisors (see below), whose sum is σ = 25707626784. Its totient is φ = 17138417848.

The previous prime is 21423022297. The next prime is 21423022343. The reversal of 21423022315 is 51322032412.

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

It is a cyclic number.

It is not a de Polignac number, because 21423022315 - 2⁹ = 21423021803 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 21423022315.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2142302227 + ... + 2142302236.

It is an arithmetic number, because the mean of its divisors is an integer number (6426906696).

Almost surely, 2^21423022315 is an apocalyptic number.

21423022315 is a deficient number, since it is larger than the sum of its proper divisors (4284604469).

21423022315 is an equidigital number, since it uses as much as digits as its factorization.

21423022315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4284604468.

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 21423022315 its reverse (51322032412), we get a palindrome (72745054727).

The spelling of 21423022315 in words is "twenty-one billion, four hundred twenty-three million, twenty-two thousand, three hundred fifteen".