2123881291 has 16 divisors (see below), whose sum is σ = 2463920640. Its totient is φ = 1793050560.

The previous prime is 2123881283. The next prime is 2123881301. The reversal of 2123881291 is 1921883212.

It is not a de Polignac number, because 2123881291 - 2³ = 2123881283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123881291.

It is not an unprimeable number, because it can be changed into a prime (2123882291) 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, 822240 + ... + 824818.

It is an arithmetic number, because the mean of its divisors is an integer number (153995040).

Almost surely, 2^2123881291 is an apocalyptic number.

2123881291 is a deficient number, since it is larger than the sum of its proper divisors (340039349).

2123881291 is a wasteful number, since it uses less digits than its factorization.

2123881291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4314.

The product of its digits is 13824, while the sum is 37.

The square root of 2123881291 is about 46085.5865862636. The cubic root of 2123881291 is about 1285.4151466400.

It can be divided in two parts, 21238812 and 91, that added together give a triangular number (21238903 = T₆₅₁₇).

The spelling of 2123881291 in words is "two billion, one hundred twenty-three million, eight hundred eighty-one thousand, two hundred ninety-one".