21913266 has 8 divisors (see below), whose sum is σ = 43826544. Its totient is φ = 7304420.

The previous prime is 21913237. The next prime is 21913277. The reversal of 21913266 is 66231912.

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

21913266 is an admirable number.

It is a super-3 number, since 3×21913266³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1826100 + ... + 1826111.

It is an arithmetic number, because the mean of its divisors is an integer number (5478318).

Almost surely, 2^21913266 is an apocalyptic number.

21913266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21913266 is a wasteful number, since it uses less digits than its factorization.

21913266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3652216.

The product of its digits is 3888, while the sum is 30.

The square root of 21913266 is about 4681.1607534884. The cubic root of 21913266 is about 279.8352176691.

The spelling of 21913266 in words is "twenty-one million, nine hundred thirteen thousand, two hundred sixty-six".