21801074 has 8 divisors (see below), whose sum is σ = 32959488. Its totient is φ = 10814580.

The previous prime is 21801071. The next prime is 21801097. The reversal of 21801074 is 47010812.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21801071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42662 + ... + 43169.

It is an arithmetic number, because the mean of its divisors is an integer number (4119936).

Almost surely, 2^21801074 is an apocalyptic number.

21801074 is a deficient number, since it is larger than the sum of its proper divisors (11158414).

21801074 is a wasteful number, since it uses less digits than its factorization.

21801074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85960.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 21801074 is about 4669.1620233185. The cubic root of 21801074 is about 279.3568315771.

Adding to 21801074 its reverse (47010812), we get a palindrome (68811886).

The spelling of 21801074 in words is "twenty-one million, eight hundred one thousand, seventy-four".