2129443291 has 16 divisors (see below), whose sum is σ = 2264248800. Its totient is φ = 1999162368.

The previous prime is 2129443243. The next prime is 2129443331. The reversal of 2129443291 is 1923449212.

It is a cyclic number.

It is not a de Polignac number, because 2129443291 - 2⁹ = 2129442779 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 2129443291.

It is not an unprimeable number, because it can be changed into a prime (2129443091) 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, 281835 + ... + 289291.

It is an arithmetic number, because the mean of its divisors is an integer number (141515550).

Almost surely, 2^2129443291 is an apocalyptic number.

2129443291 is a deficient number, since it is larger than the sum of its proper divisors (134805509).

2129443291 is a wasteful number, since it uses less digits than its factorization.

2129443291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7758.

The product of its digits is 31104, while the sum is 37.

The square root of 2129443291 is about 46145.8913772396. The cubic root of 2129443291 is about 1286.5362461955.

The spelling of 2129443291 in words is "two billion, one hundred twenty-nine million, four hundred forty-three thousand, two hundred ninety-one".