21089982619 has 4 divisors (see below), whose sum is σ = 21102946744. Its totient is φ = 21077018496.

The previous prime is 21089982601. The next prime is 21089982631. The reversal of 21089982619 is 91628998012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21089982619 - 2⁷ = 21089982491 is a prime.

It is a super-2 number, since 2×21089982619² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21089982619.

It is not an unprimeable number, because it can be changed into a prime (21089952619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6479622 + ... + 6482875.

It is an arithmetic number, because the mean of its divisors is an integer number (5275736686).

Almost surely, 2^21089982619 is an apocalyptic number.

21089982619 is a deficient number, since it is larger than the sum of its proper divisors (12964125).

21089982619 is a wasteful number, since it uses less digits than its factorization.

21089982619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12964124.

The product of its (nonzero) digits is 1119744, while the sum is 55.

The spelling of 21089982619 in words is "twenty-one billion, eighty-nine million, nine hundred eighty-two thousand, six hundred nineteen".