21335168774 has 4 divisors (see below), whose sum is σ = 32002753164. Its totient is φ = 10667584386.

The previous prime is 21335168749. The next prime is 21335168801. The reversal of 21335168774 is 47786153312.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5333792192 + ... + 5333792195.

It is an arithmetic number, because the mean of its divisors is an integer number (8000688291).

Almost surely, 2^21335168774 is an apocalyptic number.

21335168774 is a deficient number, since it is larger than the sum of its proper divisors (10667584390).

21335168774 is a wasteful number, since it uses less digits than its factorization.

21335168774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10667584389.

The product of its digits is 846720, while the sum is 47.

The spelling of 21335168774 in words is "twenty-one billion, three hundred thirty-five million, one hundred sixty-eight thousand, seven hundred seventy-four".