21246379633 has 4 divisors (see below), whose sum is σ = 22364610160. Its totient is φ = 20128149108.

The previous prime is 21246379607. The next prime is 21246379691. The reversal of 21246379633 is 33697364212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21246379633 - 2⁵ = 21246379601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21246379733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 559115235 + ... + 559115272.

It is an arithmetic number, because the mean of its divisors is an integer number (5591152540).

Almost surely, 2^21246379633 is an apocalyptic number.

It is an amenable number.

21246379633 is a deficient number, since it is larger than the sum of its proper divisors (1118230527).

21246379633 is a wasteful number, since it uses less digits than its factorization.

21246379633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118230526.

The product of its digits is 979776, while the sum is 46.

The spelling of 21246379633 in words is "twenty-one billion, two hundred forty-six million, three hundred seventy-nine thousand, six hundred thirty-three".