21830197865 has 16 divisors (see below), whose sum is σ = 30575549952. Its totient is φ = 14650782144.

The previous prime is 21830197843. The next prime is 21830197871. The reversal of 21830197865 is 56879103812.

It is a cyclic number.

It is not a de Polignac number, because 21830197865 - 2³⁴ = 4650328681 is a prime.

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, 6633674 + ... + 6636963.

It is an arithmetic number, because the mean of its divisors is an integer number (1910971872).

Almost surely, 2^21830197865 is an apocalyptic number.

It is an amenable number.

21830197865 is a deficient number, since it is larger than the sum of its proper divisors (8745352087).

21830197865 is a wasteful number, since it uses less digits than its factorization.

21830197865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13270696.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 21830197865 in words is "twenty-one billion, eight hundred thirty million, one hundred ninety-seven thousand, eight hundred sixty-five".