21227800 has 48 divisors (see below), whose sum is σ = 53847000. Its totient is φ = 7718400.

The previous prime is 21227783. The next prime is 21227819. The reversal of 21227800 is 872212.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2625 + ... + 7024.

Almost surely, 2^21227800 is an apocalyptic number.

21227800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21227800 is an abundant number, since it is smaller than the sum of its proper divisors (32619200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21227800 is a wasteful number, since it uses less digits than its factorization.

21227800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9676 (or 9667 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 22.

The square root of 21227800 is about 4607.3636713418. The cubic root of 21227800 is about 276.8864240030.

The spelling of 21227800 in words is "twenty-one million, two hundred twenty-seven thousand, eight hundred".