21361694 has 16 divisors (see below), whose sum is σ = 32585328. Its totient is φ = 10501632.

The previous prime is 21361619. The next prime is 21361709. The reversal of 21361694 is 49616312.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21361694.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36734 + ... + 37310.

It is an arithmetic number, because the mean of its divisors is an integer number (2036583).

Almost surely, 2^21361694 is an apocalyptic number.

21361694 is a deficient number, since it is larger than the sum of its proper divisors (11223634).

21361694 is a wasteful number, since it uses less digits than its factorization.

21361694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 7776, while the sum is 32.

The square root of 21361694 is about 4621.8712660566. The cubic root of 21361694 is about 277.4673564935.

The spelling of 21361694 in words is "twenty-one million, three hundred sixty-one thousand, six hundred ninety-four".