21233221121 has 16 divisors (see below), whose sum is σ = 25345675008. Its totient is φ = 17392056000.

The previous prime is 21233221063. The next prime is 21233221123. The reversal of 21233221121 is 12112233212.

It is a cyclic number.

It is not a de Polignac number, because 21233221121 - 2⁶ = 21233221057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21233221093 and 21233221102.

It is not an unprimeable number, because it can be changed into a prime (21233221123) 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, 108671 + ... + 232971.

It is an arithmetic number, because the mean of its divisors is an integer number (1584104688).

Almost surely, 2^21233221121 is an apocalyptic number.

It is an amenable number.

21233221121 is a deficient number, since it is larger than the sum of its proper divisors (4112453887).

21233221121 is a wasteful number, since it uses less digits than its factorization.

21233221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125392.

The product of its digits is 288, while the sum is 20.

Adding to 21233221121 its reverse (12112233212), we get a palindrome (33345454333).

The spelling of 21233221121 in words is "twenty-one billion, two hundred thirty-three million, two hundred twenty-one thousand, one hundred twenty-one".