21223331121 has 32 divisors (see below), whose sum is σ = 30204281088. Its totient is φ = 13226653440.

The previous prime is 21223331093. The next prime is 21223331141. The reversal of 21223331121 is 12113332212.

It is not a de Polignac number, because 21223331121 - 2²⁶ = 21156222257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21223331141) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 644755 + ... + 676871.

It is an arithmetic number, because the mean of its divisors is an integer number (943883784).

Almost surely, 2^21223331121 is an apocalyptic number.

It is an amenable number.

21223331121 is a deficient number, since it is larger than the sum of its proper divisors (8980949967).

21223331121 is a wasteful number, since it uses less digits than its factorization.

21223331121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32361.

The product of its digits is 432, while the sum is 21.

Adding to 21223331121 its reverse (12113332212), we get a palindrome (33336663333).

The spelling of 21223331121 in words is "twenty-one billion, two hundred twenty-three million, three hundred thirty-one thousand, one hundred twenty-one".