21197695 has 8 divisors (see below), whose sum is σ = 26314560. Its totient is φ = 16373280.

The previous prime is 21197681. The next prime is 21197699. The reversal of 21197695 is 59679112.

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

It is a de Polignac number, because none of the positive numbers 2^k-21197695 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21197699) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72951 + ... + 73240.

It is an arithmetic number, because the mean of its divisors is an integer number (3289320).

Almost surely, 2^21197695 is an apocalyptic number.

21197695 is a deficient number, since it is larger than the sum of its proper divisors (5116865).

21197695 is a wasteful number, since it uses less digits than its factorization.

21197695 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146225.

The product of its digits is 34020, while the sum is 40.

The square root of 21197695 is about 4604.0954594795. The cubic root of 21197695 is about 276.7554697918.

The spelling of 21197695 in words is "twenty-one million, one hundred ninety-seven thousand, six hundred ninety-five".