2131222321 has 8 divisors (see below), whose sum is σ = 2144199240. Its totient is φ = 2118285312.

The previous prime is 2131222283. The next prime is 2131222349. The reversal of 2131222321 is 1232221312.

It can be written as a sum of positive squares in 4 ways, for example, as 18533025 + 2112689296 = 4305^2 + 45964^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131222321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2131222351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100845 + ... + 120133.

It is an arithmetic number, because the mean of its divisors is an integer number (268024905).

Almost surely, 2^2131222321 is an apocalyptic number.

It is an amenable number.

2131222321 is a deficient number, since it is larger than the sum of its proper divisors (12976919).

2131222321 is a wasteful number, since it uses less digits than its factorization.

2131222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19955.

The product of its digits is 288, while the sum is 19.

The square root of 2131222321 is about 46165.1635001979. The cubic root of 2131222321 is about 1286.8944226728.

Adding to 2131222321 its reverse (1232221312), we get a palindrome (3363443633).

The spelling of 2131222321 in words is "two billion, one hundred thirty-one million, two hundred twenty-two thousand, three hundred twenty-one".