2151222323 has 4 divisors (see below), whose sum is σ = 2151354960. Its totient is φ = 2151089688.

The previous prime is 2151222299. The next prime is 2151222343. The reversal of 2151222323 is 3232221512.

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

It is a cyclic number.

It is not a de Polignac number, because 2151222323 - 2¹² = 2151218227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2151222343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37943 + ... + 75776.

It is an arithmetic number, because the mean of its divisors is an integer number (537838740).

Almost surely, 2^2151222323 is an apocalyptic number.

2151222323 is a deficient number, since it is larger than the sum of its proper divisors (132637).

2151222323 is a wasteful number, since it uses less digits than its factorization.

2151222323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132636.

The product of its digits is 1440, while the sum is 23.

The square root of 2151222323 is about 46381.2712525217. The cubic root of 2151222323 is about 1290.9074245578.

Adding to 2151222323 its reverse (3232221512), we get a palindrome (5383443835).

The spelling of 2151222323 in words is "two billion, one hundred fifty-one million, two hundred twenty-two thousand, three hundred twenty-three".