21222122199966 has 24 divisors (see below), whose sum is σ = 45981410311200. Its totient is φ = 7074018341856.

The previous prime is 21222122199961. The next prime is 21222122200009. The reversal of 21222122199966 is 66999122122212.

21222122199966 is a `hidden beast` number, since 2 + 122 + 212 + 219 + 9 + 96 + 6 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222122199961) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4580610 + ... + 7964058.

It is an arithmetic number, because the mean of its divisors is an integer number (1915892096300).

Almost surely, 2^{21222122199966} is an apocalyptic number.

21222122199966 is an abundant number, since it is smaller than the sum of its proper divisors (24759288111234).

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

21222122199966 is a wasteful number, since it uses less digits than its factorization.

21222122199966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3731920 (or 3731917 counting only the distinct ones).

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

The spelling of 21222122199966 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred ninety-nine thousand, nine hundred sixty-six".