6634299921 has 16 divisors (see below), whose sum is σ = 8932508928. Its totient is φ = 4379517200.

The previous prime is 6634299907. The next prime is 6634299943. The reversal of 6634299921 is 1299924366.

It is a cyclic number.

It is not a de Polignac number, because 6634299921 - 2⁹ = 6634299409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6634299121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1079026 + ... + 1085156.

It is an arithmetic number, because the mean of its divisors is an integer number (558281808).

Almost surely, 2^6634299921 is an apocalyptic number.

It is an amenable number.

6634299921 is a deficient number, since it is larger than the sum of its proper divisors (2298209007).

6634299921 is a wasteful number, since it uses less digits than its factorization.

6634299921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9612.

The product of its digits is 1259712, while the sum is 51.

The square root of 6634299921 is about 81451.2119062694. The cubic root of 6634299921 is about 1879.0212878668.

The spelling of 6634299921 in words is "six billion, six hundred thirty-four million, two hundred ninety-nine thousand, nine hundred twenty-one".