21222010121 has 12 divisors (see below), whose sum is σ = 23180971716. Its totient is φ = 19313579040.

The previous prime is 21222010097. The next prime is 21222010141. The reversal of 21222010121 is 12101022212.

It can be written as a sum of positive squares in 2 ways, for example, as 12584352400 + 8637657721 = 112180^2 + 92939^2 .

It is not a de Polignac number, because 21222010121 - 2¹⁰ = 21222009097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222010096 and 21222010105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222010141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96386 + ... + 227451.

It is an arithmetic number, because the mean of its divisors is an integer number (1931747643).

Almost surely, 2^21222010121 is an apocalyptic number.

It is an amenable number.

21222010121 is a deficient number, since it is larger than the sum of its proper divisors (1958961595).

21222010121 is an equidigital number, since it uses as much as digits as its factorization.

21222010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323992 (or 323921 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21222010121 its reverse (12101022212), we get a palindrome (33323032333).

The spelling of 21222010121 in words is "twenty-one billion, two hundred twenty-two million, ten thousand, one hundred twenty-one".