2121388717 has 8 divisors (see below), whose sum is σ = 2442952512. Its totient is φ = 1804452000.

The previous prime is 2121388697. The next prime is 2121388729. The reversal of 2121388717 is 7178831212.

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

It is a cyclic number.

It is not a de Polignac number, because 2121388717 - 2²⁷ = 1987170989 is a prime.

It is a super-2 number, since 2×2121388717² = 9000580177229812178, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2121388717.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121386717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1155784 + ... + 1157617.

It is an arithmetic number, because the mean of its divisors is an integer number (305369064).

Almost surely, 2^2121388717 is an apocalyptic number.

It is an amenable number.

2121388717 is a deficient number, since it is larger than the sum of its proper divisors (321563795).

2121388717 is a wasteful number, since it uses less digits than its factorization.

2121388717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2313539.

The product of its digits is 37632, while the sum is 40.

The square root of 2121388717 is about 46058.5357669998. The cubic root of 2121388717 is about 1284.9120980311.

The spelling of 2121388717 in words is "two billion, one hundred twenty-one million, three hundred eighty-eight thousand, seven hundred seventeen".