21195273 has 8 divisors (see below), whose sum is σ = 30829536. Its totient is φ = 12845600.

The previous prime is 21195257. The next prime is 21195299. The reversal of 21195273 is 37259112.

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

It is a cyclic number.

It is not a de Polignac number, because 21195273 - 2⁴ = 21195257 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21195273.

It is not an unprimeable number, because it can be changed into a prime (21195233) 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, 321108 + ... + 321173.

It is an arithmetic number, because the mean of its divisors is an integer number (3853692).

Almost surely, 2^21195273 is an apocalyptic number.

It is an amenable number.

21195273 is a deficient number, since it is larger than the sum of its proper divisors (9634263).

21195273 is a wasteful number, since it uses less digits than its factorization.

21195273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642295.

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

The square root of 21195273 is about 4603.8324252735. The cubic root of 21195273 is about 276.7449289086.

The spelling of 21195273 in words is "twenty-one million, one hundred ninety-five thousand, two hundred seventy-three".