21270268 has 6 divisors (see below), whose sum is σ = 37222976. Its totient is φ = 10635132.

The previous prime is 21270233. The next prime is 21270269. The reversal of 21270268 is 86207212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21270269) by changing a digit.

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 as a sum of consecutive naturals, namely, 2658780 + ... + 2658787.

Almost surely, 2^21270268 is an apocalyptic number.

It is an amenable number.

21270268 is a deficient number, since it is larger than the sum of its proper divisors (15952708).

21270268 is a wasteful number, since it uses less digits than its factorization.

21270268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5317571 (or 5317569 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 21270268 is about 4611.9700779602. The cubic root of 21270268 is about 277.0709458699.

The spelling of 21270268 in words is "twenty-one million, two hundred seventy thousand, two hundred sixty-eight".