21222011121 has 16 divisors (see below), whose sum is σ = 28570879680. Its totient is φ = 14011084800.

The previous prime is 21222011119. The next prime is 21222011141. The reversal of 21222011121 is 12111022212.

It is not a de Polignac number, because 21222011121 - 2¹ = 21222011119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222011121.

It is not an unprimeable number, because it can be changed into a prime (21222011141) 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, 103761 + ... + 230673.

It is an arithmetic number, because the mean of its divisors is an integer number (1785679980).

Almost surely, 2^21222011121 is an apocalyptic number.

It is an amenable number.

21222011121 is a deficient number, since it is larger than the sum of its proper divisors (7348868559).

21222011121 is a wasteful number, since it uses less digits than its factorization.

21222011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127456.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222011121 its reverse (12111022212), we get a palindrome (33333033333).

The spelling of 21222011121 in words is "twenty-one billion, two hundred twenty-two million, eleven thousand, one hundred twenty-one".