21715090443 has 32 divisors (see below), whose sum is σ = 34041139200. Its totient is φ = 13642927200.

The previous prime is 21715090433. The next prime is 21715090457. The reversal of 21715090443 is 34409051712.

It is not a de Polignac number, because 21715090443 - 2¹⁰ = 21715089419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21715090398 and 21715090407.

It is not an unprimeable number, because it can be changed into a prime (21715090433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12828 + ... + 208793.

It is an arithmetic number, because the mean of its divisors is an integer number (1063785600).

Almost surely, 2^21715090443 is an apocalyptic number.

21715090443 is a deficient number, since it is larger than the sum of its proper divisors (12326048757).

21715090443 is a wasteful number, since it uses less digits than its factorization.

21715090443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221840 (or 221834 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 21715090443 in words is "twenty-one billion, seven hundred fifteen million, ninety thousand, four hundred forty-three".