21042296 has 32 divisors (see below), whose sum is σ = 43217280. Its totient is φ = 9525600.

The previous prime is 21042293. The next prime is 21042317. The reversal of 21042296 is 69224012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21042293) 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, 42611 + ... + 43101.

It is an arithmetic number, because the mean of its divisors is an integer number (1350540).

Almost surely, 2^21042296 is an apocalyptic number.

It is an amenable number.

21042296 is an abundant number, since it is smaller than the sum of its proper divisors (22174984).

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

21042296 is a wasteful number, since it uses less digits than its factorization.

21042296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 995 (or 991 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 21042296 is about 4587.1882455378. The cubic root of 21042296 is about 276.0775179586.

The spelling of 21042296 in words is "twenty-one million, forty-two thousand, two hundred ninety-six".