21480815659 has 8 divisors (see below), whose sum is σ = 21946096352. Its totient is φ = 21019184640.

The previous prime is 21480815651. The next prime is 21480815669. The reversal of 21480815659 is 95651808412.

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 21480815659 - 2³ = 21480815651 is a prime.

It is a super-2 number, since 2×21480815659² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21480815651) 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, 900519 + ... + 924064.

It is an arithmetic number, because the mean of its divisors is an integer number (2743262044).

Almost surely, 2^21480815659 is an apocalyptic number.

21480815659 is a deficient number, since it is larger than the sum of its proper divisors (465280693).

21480815659 is a wasteful number, since it uses less digits than its factorization.

21480815659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1824837.

The product of its (nonzero) digits is 691200, while the sum is 49.

The spelling of 21480815659 in words is "twenty-one billion, four hundred eighty million, eight hundred fifteen thousand, six hundred fifty-nine".