21260228 has 24 divisors (see below), whose sum is σ = 41149920. Its totient is φ = 9529920.

The previous prime is 21260227. The next prime is 21260233. The reversal of 21260228 is 82206212.

It is a super-2 number, since 2×21260228² = 903994589223968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21260227) 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, 98 + ... + 6521.

It is an arithmetic number, because the mean of its divisors is an integer number (1714580).

Almost surely, 2^21260228 is an apocalyptic number.

It is an amenable number.

21260228 is a deficient number, since it is larger than the sum of its proper divisors (19889692).

21260228 is a wasteful number, since it uses less digits than its factorization.

21260228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6707 (or 6705 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 21260228 is about 4610.8814775485. The cubic root of 21260228 is about 277.0273446312.

The spelling of 21260228 in words is "twenty-one million, two hundred sixty thousand, two hundred twenty-eight".