21893378 has 32 divisors (see below), whose sum is σ = 38126592. Its totient is φ = 9345600.

The previous prime is 21893353. The next prime is 21893387. The reversal of 21893378 is 87339812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17948 + ... + 19128.

It is an arithmetic number, because the mean of its divisors is an integer number (1191456).

Almost surely, 2^21893378 is an apocalyptic number.

21893378 is a deficient number, since it is larger than the sum of its proper divisors (16233214).

21893378 is a wasteful number, since it uses less digits than its factorization.

21893378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1250.

The product of its digits is 72576, while the sum is 41.

The square root of 21893378 is about 4679.0360118298. The cubic root of 21893378 is about 279.7505346081.

The spelling of 21893378 in words is "twenty-one million, eight hundred ninety-three thousand, three hundred seventy-eight".