21966201 has 16 divisors (see below), whose sum is σ = 33337920. Its totient is φ = 14286240.

The previous prime is 21966181. The next prime is 21966209. The reversal of 21966201 is 10266912.

It is not a de Polignac number, because 21966201 - 2¹³ = 21958009 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21966209) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8815 + ... + 11028.

It is an arithmetic number, because the mean of its divisors is an integer number (2083620).

Almost surely, 2^21966201 is an apocalyptic number.

It is an amenable number.

21966201 is a deficient number, since it is larger than the sum of its proper divisors (11371719).

21966201 is a wasteful number, since it uses less digits than its factorization.

21966201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19893 (or 19887 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21966201 is about 4686.8113894203. The cubic root of 21966201 is about 280.0603653862.

The spelling of 21966201 in words is "twenty-one million, nine hundred sixty-six thousand, two hundred one".