21082266 has 24 divisors (see below), whose sum is σ = 45763380. Its totient is φ = 7014336.

The previous prime is 21082253. The next prime is 21082277. The reversal of 21082266 is 66228012.

It can be written as a sum of positive squares in 2 ways, for example, as 19316025 + 1766241 = 4395^2 + 1329^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16540 + ... + 17768.

Almost surely, 2^21082266 is an apocalyptic number.

21082266 is an abundant number, since it is smaller than the sum of its proper divisors (24681114).

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

21082266 is a wasteful number, since it uses less digits than its factorization.

21082266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2190 (or 2187 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 21082266 is about 4591.5428779442. The cubic root of 21082266 is about 276.2522111710.

The spelling of 21082266 in words is "twenty-one million, eighty-two thousand, two hundred sixty-six".