21276800993 has 16 divisors (see below), whose sum is σ = 25838383104. Its totient is φ = 17103367680.

The previous prime is 21276800977. The next prime is 21276801001. The reversal of 21276800993 is 39900867212.

It is a happy number.

It is not a de Polignac number, because 21276800993 - 2⁴ = 21276800977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21276800953) 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, 284705 + ... + 351582.

It is an arithmetic number, because the mean of its divisors is an integer number (1614898944).

Almost surely, 2^21276800993 is an apocalyptic number.

It is an amenable number.

21276800993 is a deficient number, since it is larger than the sum of its proper divisors (4561582111).

21276800993 is a wasteful number, since it uses less digits than its factorization.

21276800993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636592.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 21276800993 in words is "twenty-one billion, two hundred seventy-six million, eight hundred thousand, nine hundred ninety-three".