21966354 has 12 divisors (see below), whose sum is σ = 47593806. Its totient is φ = 7322112.

The previous prime is 21966331. The next prime is 21966359. The reversal of 21966354 is 45366912.

It is a happy number.

21966354 is a `hidden beast` number, since 2 + 19 + 6 + 635 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 14265729 + 7700625 = 3777^2 + 2775^2 .

It is not an unprimeable number, because it can be changed into a prime (21966359) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610159 + ... + 610194.

Almost surely, 2^21966354 is an apocalyptic number.

21966354 is an abundant number, since it is smaller than the sum of its proper divisors (25627452).

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

21966354 is a wasteful number, since it uses less digits than its factorization.

21966354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1220361 (or 1220358 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 21966354 is about 4686.8277117897. The cubic root of 21966354 is about 280.0610156145.

The spelling of 21966354 in words is "twenty-one million, nine hundred sixty-six thousand, three hundred fifty-four".