21412096591 has 4 divisors (see below), whose sum is σ = 21444887592. Its totient is φ = 21379305592.

The previous prime is 21412096579. The next prime is 21412096609. The reversal of 21412096591 is 19569021412.

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 21412096591 - 2¹⁵ = 21412063823 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21412096091) 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, 16394521 + ... + 16395826.

It is an arithmetic number, because the mean of its divisors is an integer number (5361221898).

Almost surely, 2^21412096591 is an apocalyptic number.

21412096591 is a deficient number, since it is larger than the sum of its proper divisors (32791001).

21412096591 is an equidigital number, since it uses as much as digits as its factorization.

21412096591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32791000.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 21412096591 in words is "twenty-one billion, four hundred twelve million, ninety-six thousand, five hundred ninety-one".