221222201199966 has 64 divisors (see below), whose sum is σ = 494934966835200. Its totient is φ = 73241369316000.

The previous prime is 221222201199949. The next prime is 221222201199977. The reversal of 221222201199966 is 669991102222122.

221222201199966 is a `hidden beast` number, since 2 + 21 + 222 + 201 + 199 + 9 + 6 + 6 = 666.

221222201199966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52277275 + ... + 56350313.

It is an arithmetic number, because the mean of its divisors is an integer number (7733358856800).

Almost surely, 2^{221222201199966} is an apocalyptic number.

221222201199966 is an abundant number, since it is smaller than the sum of its proper divisors (273712765635234).

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

221222201199966 is a wasteful number, since it uses less digits than its factorization.

221222201199966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4079862 (or 4079856 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 221222201199966 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, one hundred ninety-nine thousand, nine hundred sixty-six".