21363900 has 144 divisors (see below), whose sum is σ = 67495680. Its totient is φ = 5196800.

The previous prime is 21363899. The next prime is 21363907. The reversal of 21363900 is 936312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363907) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 300865 + ... + 300935.

It is an arithmetic number, because the mean of its divisors is an integer number (468720).

Almost surely, 2^21363900 is an apocalyptic number.

21363900 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 21363900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33747840).

21363900 is an abundant number, since it is smaller than the sum of its proper divisors (46131780).

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

21363900 is a wasteful number, since it uses less digits than its factorization.

21363900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 24.

The square root of 21363900 is about 4622.1099078235. The cubic root of 21363900 is about 277.4769074201.

The spelling of 21363900 in words is "twenty-one million, three hundred sixty-three thousand, nine hundred".