21605358086 has 8 divisors (see below), whose sum is σ = 34900963104. Its totient is φ = 9971703720.

The previous prime is 21605358029. The next prime is 21605358097. The reversal of 21605358086 is 68085350612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415487630 + ... + 415487681.

It is an arithmetic number, because the mean of its divisors is an integer number (4362620388).

Almost surely, 2^21605358086 is an apocalyptic number.

21605358086 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21605358086 is a deficient number, since it is larger than the sum of its proper divisors (13295605018).

21605358086 is a wasteful number, since it uses less digits than its factorization.

21605358086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 830975326.

The product of its (nonzero) digits is 345600, while the sum is 44.

The spelling of 21605358086 in words is "twenty-one billion, six hundred five million, three hundred fifty-eight thousand, eighty-six".