21078192 has 40 divisors (see below), whose sum is σ = 54818416. Its totient is φ = 6978816.

The previous prime is 21078191. The next prime is 21078209. The reversal of 21078192 is 29187012.

It is not an unprimeable number, because it can be changed into a prime (21078191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6138 + ... + 8934.

Almost surely, 2^21078192 is an apocalyptic number.

It is an amenable number.

21078192 is an abundant number, since it is smaller than the sum of its proper divisors (33740224).

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

21078192 is a wasteful number, since it uses less digits than its factorization.

21078192 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2965 (or 2959 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 21078192 is about 4591.0992147851. The cubic root of 21078192 is about 276.2344154241.

The spelling of 21078192 in words is "twenty-one million, seventy-eight thousand, one hundred ninety-two".