21110663874517 has 32 divisors (see below), whose sum is σ = 25517016391680. Its totient is φ = 17061054338880.

The previous prime is 21110663874511. The next prime is 21110663874523. The reversal of 21110663874517 is 71547836601112.

It is an interprime number because it is at equal distance from previous prime (21110663874511) and next prime (21110663874523).

It is a cyclic number.

It is not a de Polignac number, because 21110663874517 - 2¹⁹ = 21110663350229 is a prime.

It is a super-2 number, since 2×21110663874517² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110663874511) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87947292 + ... + 88187002.

It is an arithmetic number, because the mean of its divisors is an integer number (797406762240).

Almost surely, 2^{21110663874517} is an apocalyptic number.

It is an amenable number.

21110663874517 is a deficient number, since it is larger than the sum of its proper divisors (4406352517163).

21110663874517 is a wasteful number, since it uses less digits than its factorization.

21110663874517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242881.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 21110663874517 in words is "twenty-one trillion, one hundred ten billion, six hundred sixty-three million, eight hundred seventy-four thousand, five hundred seventeen".