21633077641 has 4 divisors (see below), whose sum is σ = 24723517312. Its totient is φ = 18542637972.

The previous prime is 21633077621. The next prime is 21633077663. The reversal of 21633077641 is 14677033612.

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 21633077641 - 2¹¹ = 21633075593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21633077594 and 21633077603.

It is not an unprimeable number, because it can be changed into a prime (21633077621) 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, 1545219825 + ... + 1545219838.

It is an arithmetic number, because the mean of its divisors is an integer number (6180879328).

Almost surely, 2^21633077641 is an apocalyptic number.

It is an amenable number.

21633077641 is a deficient number, since it is larger than the sum of its proper divisors (3090439671).

21633077641 is an equidigital number, since it uses as much as digits as its factorization.

21633077641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3090439670.

The product of its (nonzero) digits is 127008, while the sum is 40.

The spelling of 21633077641 in words is "twenty-one billion, six hundred thirty-three million, seventy-seven thousand, six hundred forty-one".