21788298 has 32 divisors (see below), whose sum is σ = 55336320. Its totient is φ = 6225120.

The previous prime is 21788297. The next prime is 21788341. The reversal of 21788298 is 89288712.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21788293) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28443 + ... + 29198.

It is an arithmetic number, because the mean of its divisors is an integer number (1729260).

Almost surely, 2^21788298 is an apocalyptic number.

21788298 is an abundant number, since it is smaller than the sum of its proper divisors (33548022).

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

21788298 is a wasteful number, since it uses less digits than its factorization.

21788298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57659 (or 57653 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 21788298 is about 4667.7936972407. The cubic root of 21788298 is about 279.3022507753.

The spelling of 21788298 in words is "twenty-one million, seven hundred eighty-eight thousand, two hundred ninety-eight".