21222220001994 has 80 divisors (see below), whose sum is σ = 54132039529920. Its totient is φ = 6151368104640.

The previous prime is 21222220001993. The next prime is 21222220002029. The reversal of 21222220001994 is 49910002222212.

21222220001994 is a `hidden beast` number, since 21 + 222 + 220 + 0 + 0 + 199 + 4 = 666.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222220001993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 258854979 + ... + 258936950.

It is an arithmetic number, because the mean of its divisors is an integer number (676650494124).

Almost surely, 2^{21222220001994} is an apocalyptic number.

21222220001994 is an abundant number, since it is smaller than the sum of its proper divisors (32909819527926).

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

21222220001994 is a wasteful number, since it uses less digits than its factorization.

21222220001994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 517791977 (or 517791968 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 21222220001994 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred twenty million, one thousand, nine hundred ninety-four".