21144796633 has 4 divisors (see below), whose sum is σ = 21146361268. Its totient is φ = 21143232000.

The previous prime is 21144796601. The next prime is 21144796637. The reversal of 21144796633 is 33669744112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5765820489 + 15378976144 = 75933^2 + 124012^2 .

It is a cyclic number.

It is not a de Polignac number, because 21144796633 - 2⁵ = 21144796601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21144796637) 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, 761868 + ... + 789133.

It is an arithmetic number, because the mean of its divisors is an integer number (5286590317).

Almost surely, 2^21144796633 is an apocalyptic number.

It is an amenable number.

21144796633 is a deficient number, since it is larger than the sum of its proper divisors (1564635).

21144796633 is a wasteful number, since it uses less digits than its factorization.

21144796633 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564634.

The product of its digits is 653184, while the sum is 46.

The spelling of 21144796633 in words is "twenty-one billion, one hundred forty-four million, seven hundred ninety-six thousand, six hundred thirty-three".