21695372 has 6 divisors (see below), whose sum is σ = 37966908. Its totient is φ = 10847684.

The previous prime is 21695353. The next prime is 21695389. The reversal of 21695372 is 27359612.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2711918 + ... + 2711925.

It is an arithmetic number, because the mean of its divisors is an integer number (6327818).

Almost surely, 2^21695372 is an apocalyptic number.

It is an amenable number.

21695372 is a deficient number, since it is larger than the sum of its proper divisors (16271536).

21695372 is a wasteful number, since it uses less digits than its factorization.

21695372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5423847 (or 5423845 counting only the distinct ones).

The product of its digits is 22680, while the sum is 35.

The square root of 21695372 is about 4657.8291080717. The cubic root of 21695372 is about 278.9046149012.

The spelling of 21695372 in words is "twenty-one million, six hundred ninety-five thousand, three hundred seventy-two".