21322322121 has 4 divisors (see below), whose sum is σ = 28429762832. Its totient is φ = 14214881412.

The previous prime is 21322322111. The next prime is 21322322137. The reversal of 21322322121 is 12122322312.

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 21322322121 - 2⁵ = 21322322089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21322322111) 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, 3553720351 + ... + 3553720356.

It is an arithmetic number, because the mean of its divisors is an integer number (7107440708).

Almost surely, 2^21322322121 is an apocalyptic number.

It is an amenable number.

21322322121 is a deficient number, since it is larger than the sum of its proper divisors (7107440711).

21322322121 is an equidigital number, since it uses as much as digits as its factorization.

21322322121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7107440710.

The product of its digits is 576, while the sum is 21.

Adding to 21322322121 its reverse (12122322312), we get a palindrome (33444644433).

The spelling of 21322322121 in words is "twenty-one billion, three hundred twenty-two million, three hundred twenty-two thousand, one hundred twenty-one".