221222010001212 has 144 divisors (see below), whose sum is σ = 663378272680032. Its totient is φ = 61388388311040.

The previous prime is 221222010001133. The next prime is 221222010001303. The reversal of 221222010001212 is 212100010222122.

It is a happy number.

221222010001212 is a `hidden beast` number, since 221 + 2 + 220 + 10 + 0 + 0 + 1 + 212 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 443822013 + ... + 444320180.

It is an arithmetic number, because the mean of its divisors is an integer number (4606793560278).

Almost surely, 2^{221222010001212} is an apocalyptic number.

221222010001212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221222010001212 is an abundant number, since it is smaller than the sum of its proper divisors (442156262678820).

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

221222010001212 is a wasteful number, since it uses less digits than its factorization.

221222010001212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888142268 (or 888142263 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 221222010001212 its reverse (212100010222122), we get a palindrome (433322020223334).

The spelling of 221222010001212 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, ten million, one thousand, two hundred twelve".