21428302 has 16 divisors (see below), whose sum is σ = 36972000. Its totient is φ = 9124128.

The previous prime is 21428243. The next prime is 21428317. The reversal of 21428302 is 20382412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2677 + ... + 7072.

It is an arithmetic number, because the mean of its divisors is an integer number (2310750).

Almost surely, 2^21428302 is an apocalyptic number.

21428302 is a deficient number, since it is larger than the sum of its proper divisors (15543698).

21428302 is a wasteful number, since it uses less digits than its factorization.

21428302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9915.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 21428302 is about 4629.0713971595. The cubic root of 21428302 is about 277.7554480302.

The spelling of 21428302 in words is "twenty-one million, four hundred twenty-eight thousand, three hundred two".