21359400 has 96 divisors (see below), whose sum is σ = 67079040. Its totient is φ = 5621760.

The previous prime is 21359389. The next prime is 21359413. The reversal of 21359400 is 495312.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58017 + ... + 58383.

It is an arithmetic number, because the mean of its divisors is an integer number (698740).

Almost surely, 2^21359400 is an apocalyptic number.

21359400 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 21359400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33539520).

21359400 is an abundant number, since it is smaller than the sum of its proper divisors (45719640).

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

21359400 is a wasteful number, since it uses less digits than its factorization.

21359400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 474 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 21359400 is about 4621.6230915123. The cubic root of 21359400 is about 277.4574238714.

The spelling of 21359400 in words is "twenty-one million, three hundred fifty-nine thousand, four hundred".