21550122323 has 4 divisors (see below), whose sum is σ = 21550885608. Its totient is φ = 21549359040.

The previous prime is 21550122263. The next prime is 21550122337. The reversal of 21550122323 is 32322105512.

It is a happy number.

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 21550122323 - 2¹⁴ = 21550105939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21550122292 and 21550122301.

It is not an unprimeable number, because it can be changed into a prime (21550122523) 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, 337598 + ... + 396323.

It is an arithmetic number, because the mean of its divisors is an integer number (5387721402).

Almost surely, 2^21550122323 is an apocalyptic number.

21550122323 is a deficient number, since it is larger than the sum of its proper divisors (763285).

21550122323 is an equidigital number, since it uses as much as digits as its factorization.

21550122323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763284.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 21550122323 its reverse (32322105512), we get a palindrome (53872227835).

The spelling of 21550122323 in words is "twenty-one billion, five hundred fifty million, one hundred twenty-two thousand, three hundred twenty-three".