21227700 has 72 divisors (see below), whose sum is σ = 66155488. Its totient is φ = 5224320.

The previous prime is 21227699. The next prime is 21227707. The reversal of 21227700 is 772212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227707) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1179 + ... + 6621.

Almost surely, 2^21227700 is an apocalyptic number.

21227700 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21227700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33077744).

21227700 is an abundant number, since it is smaller than the sum of its proper divisors (44927788).

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

21227700 is a wasteful number, since it uses less digits than its factorization.

21227700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5473 (or 5466 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 21227700 is about 4607.3528191360. The cubic root of 21227700 is about 276.8859892164.

Adding to 21227700 its reverse (772212), we get a palindrome (21999912).

The spelling of 21227700 in words is "twenty-one million, two hundred twenty-seven thousand, seven hundred".