21363478 has 8 divisors (see below), whose sum is σ = 32083272. Its totient is φ = 10669056.

The previous prime is 21363469. The next prime is 21363497. The reversal of 21363478 is 87436312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4075 + ... + 7702.

It is an arithmetic number, because the mean of its divisors is an integer number (4010409).

Almost surely, 2^21363478 is an apocalyptic number.

21363478 is a deficient number, since it is larger than the sum of its proper divisors (10719794).

21363478 is a wasteful number, since it uses less digits than its factorization.

21363478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12686.

The product of its digits is 24192, while the sum is 34.

The square root of 21363478 is about 4622.0642574503. The cubic root of 21363478 is about 277.4750804125.

The spelling of 21363478 in words is "twenty-one million, three hundred sixty-three thousand, four hundred seventy-eight".