21795243 has 8 divisors (see below), whose sum is σ = 29608848. Its totient is φ = 14255904.

The previous prime is 21795233. The next prime is 21795247. The reversal of 21795243 is 34259712.

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

It is not a de Polignac number, because 21795243 - 2⁴ = 21795227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21795247) 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, 68380 + ... + 68697.

It is an arithmetic number, because the mean of its divisors is an integer number (3701106).

Almost surely, 2^21795243 is an apocalyptic number.

21795243 is a deficient number, since it is larger than the sum of its proper divisors (7813605).

21795243 is a wasteful number, since it uses less digits than its factorization.

21795243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137133.

The product of its digits is 15120, while the sum is 33.

The square root of 21795243 is about 4668.5375654481. The cubic root of 21795243 is about 279.3319234016.

The spelling of 21795243 in words is "twenty-one million, seven hundred ninety-five thousand, two hundred forty-three".