21272268 has 24 divisors (see below), whose sum is σ = 49858480. Its totient is φ = 7058880.

The previous prime is 21272213. The next prime is 21272269. The reversal of 21272268 is 86227212.

It is not an unprimeable number, because it can be changed into a prime (21272269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1123 + ... + 6618.

Almost surely, 2^21272268 is an apocalyptic number.

It is an amenable number.

21272268 is an abundant number, since it is smaller than the sum of its proper divisors (28586212).

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

21272268 is a wasteful number, since it uses less digits than its factorization.

21272268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7977 (or 7975 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 21272268 is about 4612.1868999424. The cubic root of 21272268 is about 277.0796297367.

The spelling of 21272268 in words is "twenty-one million, two hundred seventy-two thousand, two hundred sixty-eight".