2123255391 has 4 divisors (see below), whose sum is σ = 2831007192. Its totient is φ = 1415503592.

The previous prime is 2123255369. The next prime is 2123255399. The reversal of 2123255391 is 1935523212.

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 2123255391 - 2¹⁴ = 2123239007 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123255399) 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, 353875896 + ... + 353875901.

It is an arithmetic number, because the mean of its divisors is an integer number (707751798).

Almost surely, 2^2123255391 is an apocalyptic number.

2123255391 is a deficient number, since it is larger than the sum of its proper divisors (707751801).

2123255391 is an equidigital number, since it uses as much as digits as its factorization.

2123255391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707751800.

The product of its digits is 16200, while the sum is 33.

The square root of 2123255391 is about 46078.7954595170. The cubic root of 2123255391 is about 1285.2888651966.

The spelling of 2123255391 in words is "two billion, one hundred twenty-three million, two hundred fifty-five thousand, three hundred ninety-one".