2121374639 has 4 divisors (see below), whose sum is σ = 2121528600. Its totient is φ = 2121220680.

The previous prime is 2121374627. The next prime is 2121374641. The reversal of 2121374639 is 9364731212.

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 2121374639 - 2²⁴ = 2104597423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121364639) 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, 54032 + ... + 84629.

It is an arithmetic number, because the mean of its divisors is an integer number (530382150).

Almost surely, 2^2121374639 is an apocalyptic number.

2121374639 is a deficient number, since it is larger than the sum of its proper divisors (153961).

2121374639 is a wasteful number, since it uses less digits than its factorization.

2121374639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153960.

The product of its digits is 54432, while the sum is 38.

The square root of 2121374639 is about 46058.3829394824. The cubic root of 2121374639 is about 1284.9092557054.

The spelling of 2121374639 in words is "two billion, one hundred twenty-one million, three hundred seventy-four thousand, six hundred thirty-nine".