21335318894 has 8 divisors (see below), whose sum is σ = 32121071328. Its totient is φ = 10628295120.

The previous prime is 21335318887. The next prime is 21335318951. The reversal of 21335318894 is 49881353312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19681487 + ... + 19682570.

It is an arithmetic number, because the mean of its divisors is an integer number (4015133916).

Almost surely, 2^21335318894 is an apocalyptic number.

21335318894 is a deficient number, since it is larger than the sum of its proper divisors (10785752434).

21335318894 is a wasteful number, since it uses less digits than its factorization.

21335318894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39364330.

The product of its digits is 622080, while the sum is 47.

The spelling of 21335318894 in words is "twenty-one billion, three hundred thirty-five million, three hundred eighteen thousand, eight hundred ninety-four".