21022122321 has 16 divisors (see below), whose sum is σ = 31149417600. Its totient is φ = 14012258544.

The previous prime is 21022122311. The next prime is 21022122343. The reversal of 21022122321 is 12322122012.

21022122321 is a `hidden beast` number, since 210 + 221 + 2 + 232 + 1 = 666.

It is not a de Polignac number, because 21022122321 - 2⁶ = 21022122257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21022122294 and 21022122303.

It is not an unprimeable number, because it can be changed into a prime (21022122311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92515 + ... + 224951.

It is an arithmetic number, because the mean of its divisors is an integer number (1946838600).

Almost surely, 2^21022122321 is an apocalyptic number.

It is an amenable number.

21022122321 is a deficient number, since it is larger than the sum of its proper divisors (10127295279).

21022122321 is a wasteful number, since it uses less digits than its factorization.

21022122321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138325 (or 138319 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21022122321 its reverse (12322122012), we get a palindrome (33344244333).

The spelling of 21022122321 in words is "twenty-one billion, twenty-two million, one hundred twenty-two thousand, three hundred twenty-one".