21800452 has 6 divisors (see below), whose sum is σ = 38150798. Its totient is φ = 10900224.

The previous prime is 21800417. The next prime is 21800453. The reversal of 21800452 is 25400812.

It can be written as a sum of positive squares in only one way, i.e., 15729156 + 6071296 = 3966^2 + 2464^2 .

It is not an unprimeable number, because it can be changed into a prime (21800453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2725053 + ... + 2725060.

Almost surely, 2^21800452 is an apocalyptic number.

It is an amenable number.

21800452 is a deficient number, since it is larger than the sum of its proper divisors (16350346).

21800452 is a wasteful number, since it uses less digits than its factorization.

21800452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5450117 (or 5450115 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 21800452 is about 4669.0954156025. The cubic root of 21800452 is about 279.3541748028.

The spelling of 21800452 in words is "twenty-one million, eight hundred thousand, four hundred fifty-two".