21306966 has 8 divisors (see below), whose sum is σ = 42613944. Its totient is φ = 7102320.

The previous prime is 21306953. The next prime is 21306979. The reversal of 21306966 is 66960312.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21306953) and next prime (21306979).

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

21306966 is an admirable number.

It is a congruent 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, 1775575 + ... + 1775586.

It is an arithmetic number, because the mean of its divisors is an integer number (5326743).

Almost surely, 2^21306966 is an apocalyptic number.

21306966 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.

21306966 is a wasteful number, since it uses less digits than its factorization.

21306966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3551166.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 21306966 is about 4615.9469234384. The cubic root of 21306966 is about 277.2301995837.

The spelling of 21306966 in words is "twenty-one million, three hundred six thousand, nine hundred sixty-six".