2151222321 has 16 divisors (see below), whose sum is σ = 2897467200. Its totient is φ = 1419632448.

The previous prime is 2151222299. The next prime is 2151222343. The reversal of 2151222321 is 1232221512.

It is an interprime number because it is at equal distance from previous prime (2151222299) and next prime (2151222343).

It is not a de Polignac number, because 2151222321 - 2⁷ = 2151222193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2151222371) 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, 118210 + ... + 135188.

It is an arithmetic number, because the mean of its divisors is an integer number (181091700).

Almost surely, 2^2151222321 is an apocalyptic number.

It is an amenable number.

2151222321 is a deficient number, since it is larger than the sum of its proper divisors (746244879).

2151222321 is a wasteful number, since it uses less digits than its factorization.

2151222321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17408.

The product of its digits is 480, while the sum is 21.

The square root of 2151222321 is about 46381.2712309613. The cubic root of 2151222321 is about 1290.9074241578.

Adding to 2151222321 its reverse (1232221512), we get a palindrome (3383443833).

The spelling of 2151222321 in words is "two billion, one hundred fifty-one million, two hundred twenty-two thousand, three hundred twenty-one".