21827700 has 108 divisors (see below), whose sum is σ = 69509440. Its totient is φ = 5728320.

The previous prime is 21827683. The next prime is 21827717. The reversal of 21827700 is 772812.

It is an interprime number because it is at equal distance from previous prime (21827683) and next prime (21827717).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 70947 + ... + 71253.

Almost surely, 2^21827700 is an apocalyptic number.

21827700 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 21827700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34754720).

21827700 is an abundant number, since it is smaller than the sum of its proper divisors (47681740).

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

21827700 is a wasteful number, since it uses less digits than its factorization.

21827700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406 (or 396 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 27.

The square root of 21827700 is about 4672.0124143671. The cubic root of 21827700 is about 279.4705129633.

The spelling of 21827700 in words is "twenty-one million, eight hundred twenty-seven thousand, seven hundred".