221222022012 has 18 divisors (see below), whose sum is σ = 559200111288. Its totient is φ = 73740673992.

The previous prime is 221222022011. The next prime is 221222022019. The reversal of 221222022012 is 210220222122.

221222022012 is a `hidden beast` number, since 2 + 212 + 220 + 220 + 12 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221222022011) 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, 3072528048 + ... + 3072528119.

Almost surely, 2^221222022012 is an apocalyptic number.

It is an amenable number.

221222022012 is an abundant number, since it is smaller than the sum of its proper divisors (337978089276).

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

221222022012 is a wasteful number, since it uses less digits than its factorization.

221222022012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6145056177 (or 6145056172 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 221222022012 its reverse (210220222122), we get a palindrome (431442244134).

The spelling of 221222022012 in words is "two hundred twenty-one billion, two hundred twenty-two million, twenty-two thousand, twelve".