21830197864 has 8 divisors (see below), whose sum is σ = 40931621010. Its totient is φ = 10915098928.

The previous prime is 21830197843. The next prime is 21830197871. The reversal of 21830197864 is 46879103812.

It can be written as a sum of positive squares in only one way, i.e., 17132192100 + 4698005764 = 130890^2 + 68542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1364387359 + ... + 1364387374.

Almost surely, 2^21830197864 is an apocalyptic number.

It is an amenable number.

21830197864 is a deficient number, since it is larger than the sum of its proper divisors (19101423146).

21830197864 is a wasteful number, since it uses less digits than its factorization.

21830197864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2728774739 (or 2728774735 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 21830197864 in words is "twenty-one billion, eight hundred thirty million, one hundred ninety-seven thousand, eight hundred sixty-four".