21966246 has 12 divisors (see below), whose sum is σ = 47593572. Its totient is φ = 7322076.

The previous prime is 21966239. The next prime is 21966257. The reversal of 21966246 is 64266912.

21966246 is a `hidden beast` number, since 21 + 9 + 6 + 624 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 21966246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610156 + ... + 610191.

It is an arithmetic number, because the mean of its divisors is an integer number (3966131).

Almost surely, 2^21966246 is an apocalyptic number.

21966246 is an abundant number, since it is smaller than the sum of its proper divisors (25627326).

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

21966246 is a wasteful number, since it uses less digits than its factorization.

21966246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220355 (or 1220352 counting only the distinct ones).

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

The square root of 21966246 is about 4686.8161901231. The cubic root of 21966246 is about 280.0605566301.

The spelling of 21966246 in words is "twenty-one million, nine hundred sixty-six thousand, two hundred forty-six".