21864601 has 8 divisors (see below), whose sum is σ = 25255584. Its totient is φ = 18707520.

The previous prime is 21864587. The next prime is 21864613. The reversal of 21864601 is 10646812.

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 21864601 - 2⁵ = 21864569 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21864601.

It is not an unprimeable number, because it can be changed into a prime (21864301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58275 + ... + 58648.

It is an arithmetic number, because the mean of its divisors is an integer number (3156948).

Almost surely, 2^21864601 is an apocalyptic number.

It is an amenable number.

21864601 is a deficient number, since it is larger than the sum of its proper divisors (3390983).

21864601 is a wasteful number, since it uses less digits than its factorization.

21864601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116951.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 21864601 is about 4675.9599014534. The cubic root of 21864601 is about 279.6279113672.

The spelling of 21864601 in words is "twenty-one million, eight hundred sixty-four thousand, six hundred one".