21335602894 has 16 divisors (see below), whose sum is σ = 32248182960. Its totient is φ = 10586278080.

The previous prime is 21335602889. The next prime is 21335602969. The reversal of 21335602894 is 49820653312.

It is a super-2 number, since 2×21335602894² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21335602894.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 645802 + ... + 678034.

It is an arithmetic number, because the mean of its divisors is an integer number (2015511435).

Almost surely, 2^21335602894 is an apocalyptic number.

21335602894 is a deficient number, since it is larger than the sum of its proper divisors (10912580066).

21335602894 is a wasteful number, since it uses less digits than its factorization.

21335602894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34755.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21335602894 in words is "twenty-one billion, three hundred thirty-five million, six hundred two thousand, eight hundred ninety-four".