21363378 has 16 divisors (see below), whose sum is σ = 43769376. Its totient is φ = 6947360.

The previous prime is 21363367. The next prime is 21363383. The reversal of 21363378 is 87336312.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43176 + ... + 43667.

It is an arithmetic number, because the mean of its divisors is an integer number (2735586).

Almost surely, 2^21363378 is an apocalyptic number.

21363378 is an abundant number, since it is smaller than the sum of its proper divisors (22405998).

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

21363378 is a wasteful number, since it uses less digits than its factorization.

21363378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86889.

The product of its digits is 18144, while the sum is 33.

The square root of 21363378 is about 4622.0534397603. The cubic root of 21363378 is about 277.4746474688.

The spelling of 21363378 in words is "twenty-one million, three hundred sixty-three thousand, three hundred seventy-eight".