2117518621 has 8 divisors (see below), whose sum is σ = 2269304064. Its totient is φ = 1970709840.

The previous prime is 2117518591. The next prime is 2117518651. The reversal of 2117518621 is 1268157112.

It is an interprime number because it is at equal distance from previous prime (2117518591) and next prime (2117518651).

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 2117518621 - 2¹⁷ = 2117387549 is a prime.

It is a super-2 number, since 2×2117518621² = 8967770220563483282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2117518651) 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, 1243285 + ... + 1244986.

It is an arithmetic number, because the mean of its divisors is an integer number (283663008).

Almost surely, 2^2117518621 is an apocalyptic number.

It is an amenable number.

2117518621 is a deficient number, since it is larger than the sum of its proper divisors (151785443).

2117518621 is a wasteful number, since it uses less digits than its factorization.

2117518621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2488331.

The product of its digits is 6720, while the sum is 34.

The square root of 2117518621 is about 46016.5037894015. The cubic root of 2117518621 is about 1284.1302579476.

The spelling of 2117518621 in words is "two billion, one hundred seventeen million, five hundred eighteen thousand, six hundred twenty-one".