21160378 has 4 divisors (see below), whose sum is σ = 31740570. Its totient is φ = 10580188.

The previous prime is 21160339. The next prime is 21160379. The reversal of 21160378 is 87306112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11444689 + 9715689 = 3383^2 + 3117^2 .

It is not an unprimeable number, because it can be changed into a prime (21160379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5290093 + ... + 5290096.

Almost surely, 2^21160378 is an apocalyptic number.

21160378 is a deficient number, since it is larger than the sum of its proper divisors (10580192).

21160378 is a wasteful number, since it uses less digits than its factorization.

21160378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10580191.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 21160378 is about 4600.0410867730. The cubic root of 21160378 is about 276.5929717752.

The spelling of 21160378 in words is "twenty-one million, one hundred sixty thousand, three hundred seventy-eight".