21629766833 has 4 divisors (see below), whose sum is σ = 21632692848. Its totient is φ = 21626840820.

The previous prime is 21629766827. The next prime is 21629766853. The reversal of 21629766833 is 33866792612.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21629766833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21629766853) 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, 1451891 + ... + 1466712.

It is an arithmetic number, because the mean of its divisors is an integer number (5408173212).

Almost surely, 2^21629766833 is an apocalyptic number.

It is an amenable number.

21629766833 is a deficient number, since it is larger than the sum of its proper divisors (2926015).

21629766833 is an equidigital number, since it uses as much as digits as its factorization.

21629766833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2926014.

The product of its digits is 3919104, while the sum is 53.

The spelling of 21629766833 in words is "twenty-one billion, six hundred twenty-nine million, seven hundred sixty-six thousand, eight hundred thirty-three".