21197475 has 36 divisors (see below), whose sum is σ = 40893216. Its totient is φ = 10434240.

The previous prime is 21197447. The next prime is 21197479. The reversal of 21197475 is 57479112.

It is a happy number.

It is not a de Polignac number, because 21197475 - 2¹⁰ = 21196451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21197479) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 699 + ... + 6548.

Almost surely, 2^21197475 is an apocalyptic number.

21197475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

21197475 is a deficient number, since it is larger than the sum of its proper divisors (19695741).

21197475 is a wasteful number, since it uses less digits than its factorization.

21197475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7276 (or 7268 counting only the distinct ones).

The product of its digits is 17640, while the sum is 36.

The square root of 21197475 is about 4604.0715676453. The cubic root of 21197475 is about 276.7545123541.

The spelling of 21197475 in words is "twenty-one million, one hundred ninety-seven thousand, four hundred seventy-five".