21633673814 has 4 divisors (see below), whose sum is σ = 32450510724. Its totient is φ = 10816836906.

The previous prime is 21633673811. The next prime is 21633673877. The reversal of 21633673814 is 41837633612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633673811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5408418452 + ... + 5408418455.

It is an arithmetic number, because the mean of its divisors is an integer number (8112627681).

Almost surely, 2^21633673814 is an apocalyptic number.

21633673814 is a deficient number, since it is larger than the sum of its proper divisors (10816836910).

21633673814 is a wasteful number, since it uses less digits than its factorization.

21633673814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10816836909.

The product of its digits is 435456, while the sum is 44.

The spelling of 21633673814 in words is "twenty-one billion, six hundred thirty-three million, six hundred seventy-three thousand, eight hundred fourteen".