21695373 has 12 divisors (see below), whose sum is σ = 35814688. Its totient is φ = 12397320.

The previous prime is 21695353. The next prime is 21695389. The reversal of 21695373 is 37359612.

It is not a de Polignac number, because 21695373 - 2⁶ = 21695309 is a prime.

It is a super-3 number, since 3×21695373³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21695353) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172123 + ... + 172248.

Almost surely, 2^21695373 is an apocalyptic number.

It is an amenable number.

21695373 is a deficient number, since it is larger than the sum of its proper divisors (14119315).

21695373 is a wasteful number, since it uses less digits than its factorization.

21695373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344384 (or 344381 counting only the distinct ones).

The product of its digits is 34020, while the sum is 36.

The square root of 21695373 is about 4657.8292154178. The cubic root of 21695373 is about 278.9046191864.

The spelling of 21695373 in words is "twenty-one million, six hundred ninety-five thousand, three hundred seventy-three".