21800481 has 8 divisors (see below), whose sum is σ = 30331200. Its totient is φ = 13901712.

The previous prime is 21800453. The next prime is 21800483. The reversal of 21800481 is 18400812.

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

It is not a de Polignac number, because 21800481 - 2⁶ = 21800417 is a prime.

It is a super-2 number, since 2×21800481² = 950521943662722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21800483) 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, 157906 + ... + 158043.

It is an arithmetic number, because the mean of its divisors is an integer number (3791400).

Almost surely, 2^21800481 is an apocalyptic number.

It is an amenable number.

21800481 is a deficient number, since it is larger than the sum of its proper divisors (8530719).

21800481 is a wasteful number, since it uses less digits than its factorization.

21800481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315975.

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 21800481 is about 4669.0985211280. The cubic root of 21800481 is about 279.3542986728.

The spelling of 21800481 in words is "twenty-one million, eight hundred thousand, four hundred eighty-one".