21067378 has 8 divisors (see below), whose sum is σ = 31668480. Its totient is φ = 10511220.

The previous prime is 21067357. The next prime is 21067391. The reversal of 21067378 is 87376012.

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

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, 10038 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (3958560).

Almost surely, 2^21067378 is an apocalyptic number.

21067378 is a deficient number, since it is larger than the sum of its proper divisors (10601102).

21067378 is a wasteful number, since it uses less digits than its factorization.

21067378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22472.

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 21067378 is about 4589.9213500887. The cubic root of 21067378 is about 276.1871673810.

The spelling of 21067378 in words is "twenty-one million, sixty-seven thousand, three hundred seventy-eight".