21801452 has 6 divisors (see below), whose sum is σ = 38152548. Its totient is φ = 10900724.

The previous prime is 21801443. The next prime is 21801469. The reversal of 21801452 is 25410812.

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 as a sum of consecutive naturals, namely, 2725178 + ... + 2725185.

It is an arithmetic number, because the mean of its divisors is an integer number (6358758).

Almost surely, 2^21801452 is an apocalyptic number.

It is an amenable number.

21801452 is a deficient number, since it is larger than the sum of its proper divisors (16351096).

21801452 is a wasteful number, since it uses less digits than its factorization.

21801452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450367 (or 5450365 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21801452 is about 4669.2025014985. The cubic root of 21801452 is about 279.3584461195.

Subtracting from 21801452 its product of nonzero digits (640), we obtain a palindrome (21800812).

The spelling of 21801452 in words is "twenty-one million, eight hundred one thousand, four hundred fifty-two".