21777347026499 has 8 divisors (see below), whose sum is σ = 22308638965248. Its totient is φ = 21251677224960.

The previous prime is 21777347026481. The next prime is 21777347026511. The reversal of 21777347026499 is 99462074377712.

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 21777347026499 - 2²⁰ = 21777345977923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21777347026429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1405526462 + ... + 1405541955.

It is an arithmetic number, because the mean of its divisors is an integer number (2788579870656).

Almost surely, 2^{21777347026499} is an apocalyptic number.

21777347026499 is a deficient number, since it is larger than the sum of its proper divisors (531291938749).

21777347026499 is a wasteful number, since it uses less digits than its factorization.

21777347026499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2811068605.

The product of its (nonzero) digits is 224042112, while the sum is 68.

The spelling of 21777347026499 in words is "twenty-one trillion, seven hundred seventy-seven billion, three hundred forty-seven million, twenty-six thousand, four hundred ninety-nine".