21222231329 has 4 divisors (see below), whose sum is σ = 22854710676. Its totient is φ = 19589751984.

The previous prime is 21222231319. The next prime is 21222231391. The reversal of 21222231329 is 92313222212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9269838400 + 11952392929 = 96280^2 + 109327^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222231329 - 2²⁰ = 21221182753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21222231319) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 816239654 + ... + 816239679.

It is an arithmetic number, because the mean of its divisors is an integer number (5713677669).

Almost surely, 2^21222231329 is an apocalyptic number.

It is an amenable number.

21222231329 is a deficient number, since it is larger than the sum of its proper divisors (1632479347).

21222231329 is a wasteful number, since it uses less digits than its factorization.

21222231329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1632479346.

The product of its digits is 5184, while the sum is 29.

The spelling of 21222231329 in words is "twenty-one billion, two hundred twenty-two million, two hundred thirty-one thousand, three hundred twenty-nine".