221221221212012 has 48 divisors (see below), whose sum is σ = 459868268670720. Its totient is φ = 91105977614400.

The previous prime is 221221221212009. The next prime is 221221221212021. The reversal of 221221221212012 is 210212122122122.

221221221212012 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 645420914 + ... + 645763577.

It is an arithmetic number, because the mean of its divisors is an integer number (9580588930640).

Almost surely, 2^{221221221212012} is an apocalyptic number.

It is an amenable number.

221221221212012 is an abundant number, since it is smaller than the sum of its proper divisors (238647047458708).

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

221221221212012 is a wasteful number, since it uses less digits than its factorization.

221221221212012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1291184742 (or 1291184740 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 23.

Adding to 221221221212012 its reverse (210212122122122), we get a palindrome (431433343334134).

The spelling of 221221221212012 in words is "two hundred twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, twelve".