21830351915 has 16 divisors (see below), whose sum is σ = 26438591808. Its totient is φ = 17302957056.

The previous prime is 21830351909. The next prime is 21830351923. The reversal of 21830351915 is 51915303812.

It is a cyclic number.

It is not a de Polignac number, because 21830351915 - 2⁸ = 21830351659 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1834274 + ... + 1846136.

It is an arithmetic number, because the mean of its divisors is an integer number (1652411988).

Almost surely, 2^21830351915 is an apocalyptic number.

21830351915 is a deficient number, since it is larger than the sum of its proper divisors (4608239893).

21830351915 is a wasteful number, since it uses less digits than its factorization.

21830351915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15238.

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 21830351915 in words is "twenty-one billion, eight hundred thirty million, three hundred fifty-one thousand, nine hundred fifteen".