21814994601 has 15 divisors (see below), whose sum is σ = 32589817293. Its totient is φ = 14542443540.

The previous prime is 21814994581. The next prime is 21814994603. The reversal of 21814994601 is 10649941812.

It is a happy number.

The square root of 21814994601 is 147699.

It is a perfect power (a square), and thus also a powerful number.

21814994601 is a `hidden beast` number, since 2 + 181 + 4 + 9 + 9 + 460 + 1 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-21814994601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21814994603) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1321086 + ... + 1337496.

Almost surely, 2^21814994601 is an apocalyptic number.

21814994601 is the 147699-th square number.

21814994601 is the 73850-th centered octagonal number.

It is an amenable number.

21814994601 is a deficient number, since it is larger than the sum of its proper divisors (10774822692).

21814994601 is an frugal number, since it uses more digits than its factorization.

21814994601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32834 (or 16414 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The spelling of 21814994601 in words is "twenty-one billion, eight hundred fourteen million, nine hundred ninety-four thousand, six hundred one".