21995458 has 8 divisors (see below), whose sum is σ = 33034428. Its totient is φ = 10983984.

The previous prime is 21995453. The next prime is 21995459. The reversal of 21995458 is 85459912.

It can be written as a sum of positive squares in 2 ways, for example, as 20948929 + 1046529 = 4577^2 + 1023^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21995453) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741 + ... + 8152.

Almost surely, 2^21995458 is an apocalyptic number.

21995458 is a deficient number, since it is larger than the sum of its proper divisors (11038970).

21995458 is a wasteful number, since it uses less digits than its factorization.

21995458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13748.

The product of its digits is 129600, while the sum is 43.

The square root of 21995458 is about 4689.9315560038. The cubic root of 21995458 is about 280.1846486131.

The spelling of 21995458 in words is "twenty-one million, nine hundred ninety-five thousand, four hundred fifty-eight".