21367700 has 36 divisors (see below), whose sum is σ = 46697532. Its totient is φ = 8486400.

The previous prime is 21367699. The next prime is 21367721. The reversal of 21367700 is 776312.

It can be written as a sum of positive squares in 6 ways, for example, as 3694084 + 17673616 = 1922^2 + 4204^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21367700.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15020 + ... + 16380.

Almost surely, 2^21367700 is an apocalyptic number.

21367700 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 21367700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23348766).

21367700 is an abundant number, since it is smaller than the sum of its proper divisors (25329832).

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

21367700 is a wasteful number, since it uses less digits than its factorization.

21367700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532 (or 1525 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 26.

The square root of 21367700 is about 4622.5209572267. The cubic root of 21367700 is about 277.4933580641.

The spelling of 21367700 in words is "twenty-one million, three hundred sixty-seven thousand, seven hundred".