21266694 has 24 divisors (see below), whose sum is σ = 48789000. Its totient is φ = 6671808.

The previous prime is 21266669. The next prime is 21266731. The reversal of 21266694 is 49666212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34444 + ... + 35055.

It is an arithmetic number, because the mean of its divisors is an integer number (2032875).

Almost surely, 2^21266694 is an apocalyptic number.

21266694 is an abundant number, since it is smaller than the sum of its proper divisors (27522306).

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

21266694 is a wasteful number, since it uses less digits than its factorization.

21266694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69524 (or 69521 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 21266694 is about 4611.5825916924. The cubic root of 21266694 is about 277.0554264442.

The spelling of 21266694 in words is "twenty-one million, two hundred sixty-six thousand, six hundred ninety-four".