21526340999 has 8 divisors (see below), whose sum is σ = 21731718528. Its totient is φ = 21321041400.

The previous prime is 21526340993. The next prime is 21526341017. The reversal of 21526340999 is 99904362512.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21526340999 - 2⁸ = 21526340743 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 (21526340993) 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, 641804 + ... + 674510.

It is an arithmetic number, because the mean of its divisors is an integer number (2716464816).

Almost surely, 2^21526340999 is an apocalyptic number.

21526340999 is a deficient number, since it is larger than the sum of its proper divisors (205377529).

21526340999 is a wasteful number, since it uses less digits than its factorization.

21526340999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38965.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The spelling of 21526340999 in words is "twenty-one billion, five hundred twenty-six million, three hundred forty thousand, nine hundred ninety-nine".