221212212104 has 32 divisors (see below), whose sum is σ = 446710299840. Its totient is φ = 102090676800.

The previous prime is 221212212103. The next prime is 221212212113. The reversal of 221212212104 is 401212212122.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (221212212101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1561919 + ... + 1697649.

It is an arithmetic number, because the mean of its divisors is an integer number (13959696870).

Almost surely, 2^221212212104 is an apocalyptic number.

It is an amenable number.

221212212104 is an abundant number, since it is smaller than the sum of its proper divisors (225498087736).

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

221212212104 is a wasteful number, since it uses less digits than its factorization.

221212212104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151421 (or 151417 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 221212212104 its reverse (401212212122), we get a palindrome (622424424226).

The spelling of 221212212104 in words is "two hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred four".