21360378 has 32 divisors (see below), whose sum is σ = 46884096. Its totient is φ = 6447168.

The previous prime is 21360377. The next prime is 21360401. The reversal of 21360378 is 87306312.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21360371) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1551 + ... + 6717.

It is an arithmetic number, because the mean of its divisors is an integer number (1465128).

Almost surely, 2^21360378 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21360378, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23442048).

21360378 is an abundant number, since it is smaller than the sum of its proper divisors (25523718).

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

21360378 is a wasteful number, since it uses less digits than its factorization.

21360378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5238.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 21360378 is about 4621.7288972851. The cubic root of 21360378 is about 277.4616585287.

The spelling of 21360378 in words is "twenty-one million, three hundred sixty thousand, three hundred seventy-eight".