21377266 has 8 divisors (see below), whose sum is σ = 32426460. Its totient is φ = 10568448.

The previous prime is 21377249. The next prime is 21377269. The reversal of 21377266 is 66277312.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17397241 + 3980025 = 4171^2 + 1995^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21377269) 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 3 ways as a sum of consecutive naturals, for example, 59871 + ... + 60226.

Almost surely, 2^21377266 is an apocalyptic number.

21377266 is a deficient number, since it is larger than the sum of its proper divisors (11049194).

21377266 is a wasteful number, since it uses less digits than its factorization.

21377266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120188.

The product of its digits is 21168, while the sum is 34.

The square root of 21377266 is about 4623.5555582257. Note that the first 5 decimals coincide. The cubic root of 21377266 is about 277.5347617628.

The spelling of 21377266 in words is "twenty-one million, three hundred seventy-seven thousand, two hundred sixty-six".