21417776013 has 4 divisors (see below), whose sum is σ = 28557034688. Its totient is φ = 14278517340.

The previous prime is 21417775999. The next prime is 21417776047. The reversal of 21417776013 is 31067771412.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21417776013 - 2⁶ = 21417775949 is a prime.

It is a super-2 number, since 2×21417776013² (a number of 21 digits) 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 (21417771013) 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 3 ways as a sum of consecutive naturals, for example, 3569629333 + ... + 3569629338.

It is an arithmetic number, because the mean of its divisors is an integer number (7139258672).

Almost surely, 2^21417776013 is an apocalyptic number.

It is an amenable number.

21417776013 is a deficient number, since it is larger than the sum of its proper divisors (7139258675).

21417776013 is an equidigital number, since it uses as much as digits as its factorization.

21417776013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7139258674.

The product of its (nonzero) digits is 49392, while the sum is 39.

The spelling of 21417776013 in words is "twenty-one billion, four hundred seventeen million, seven hundred seventy-six thousand, thirteen".