21446217519 has 8 divisors (see below), whose sum is σ = 30277013040. Its totient is φ = 13456450176.

The previous prime is 21446217493. The next prime is 21446217563. The reversal of 21446217519 is 91571264412.

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

It is not a de Polignac number, because 21446217519 - 2⁷ = 21446217391 is a prime.

It is a super-2 number, since 2×21446217519² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21446217119) 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, 210256984 + ... + 210257085.

It is an arithmetic number, because the mean of its divisors is an integer number (3784626630).

Almost surely, 2^21446217519 is an apocalyptic number.

21446217519 is a deficient number, since it is larger than the sum of its proper divisors (8830795521).

21446217519 is a wasteful number, since it uses less digits than its factorization.

21446217519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420514089.

The product of its digits is 120960, while the sum is 42.

The spelling of 21446217519 in words is "twenty-one billion, four hundred forty-six million, two hundred seventeen thousand, five hundred nineteen".