2121299591 has 8 divisors (see below), whose sum is σ = 2214445920. Its totient is φ = 2028229632.

The previous prime is 2121299581. The next prime is 2121299617. The reversal of 2121299591 is 1959921212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121299591 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 (2121299501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41855 + ... + 77423.

It is an arithmetic number, because the mean of its divisors is an integer number (276805740).

Almost surely, 2^2121299591 is an apocalyptic number.

2121299591 is a deficient number, since it is larger than the sum of its proper divisors (93146329).

2121299591 is a wasteful number, since it uses less digits than its factorization.

2121299591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38185.

The product of its digits is 29160, while the sum is 41.

The square root of 2121299591 is about 46057.5682271654. The cubic root of 2121299591 is about 1284.8941034224.

The spelling of 2121299591 in words is "two billion, one hundred twenty-one million, two hundred ninety-nine thousand, five hundred ninety-one".