21197235 has 32 divisors (see below), whose sum is σ = 35085312. Its totient is φ = 10922240.

The previous prime is 21197221. The next prime is 21197251. The reversal of 21197235 is 53279112.

It is not a de Polignac number, because 21197235 - 2⁵ = 21197203 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 75295 + ... + 75575.

It is an arithmetic number, because the mean of its divisors is an integer number (1096416).

Almost surely, 2^21197235 is an apocalyptic number.

21197235 is a deficient number, since it is larger than the sum of its proper divisors (13888077).

21197235 is a wasteful number, since it uses less digits than its factorization.

21197235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443.

The product of its digits is 3780, while the sum is 30.

The square root of 21197235 is about 4604.0455036848. The cubic root of 21197235 is about 276.7534678691.

The spelling of 21197235 in words is "twenty-one million, one hundred ninety-seven thousand, two hundred thirty-five".