21322304215523 has 4 divisors (see below), whose sum is σ = 21322829966880. Its totient is φ = 21321778464168.

The previous prime is 21322304215469. The next prime is 21322304215603. The reversal of 21322304215523 is 32551240322312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21322304215523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21322304217523) 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, 262814840 + ... + 262895957.

It is an arithmetic number, because the mean of its divisors is an integer number (5330707491720).

Almost surely, 2^{21322304215523} is an apocalyptic number.

21322304215523 is a deficient number, since it is larger than the sum of its proper divisors (525751357).

21322304215523 is an equidigital number, since it uses as much as digits as its factorization.

21322304215523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525751356.

The product of its (nonzero) digits is 86400, while the sum is 35.

Adding to 21322304215523 its reverse (32551240322312), we get a palindrome (53873544537835).

The spelling of 21322304215523 in words is "twenty-one trillion, three hundred twenty-two billion, three hundred four million, two hundred fifteen thousand, five hundred twenty-three".