221021212211212 has 96 divisors (see below), whose sum is σ = 452477247344640. Its totient is φ = 92508828390720.

The previous prime is 221021212211209. The next prime is 221021212211333. The reversal of 221021212211212 is 212112212120122.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 664137537 + ... + 664470247.

It is an arithmetic number, because the mean of its divisors is an integer number (4713304659840).

Almost surely, 2^{221021212211212} is an apocalyptic number.

It is an amenable number.

221021212211212 is an abundant number, since it is smaller than the sum of its proper divisors (231456035133428).

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

221021212211212 is a wasteful number, since it uses less digits than its factorization.

221021212211212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335411 (or 335409 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 22.

Adding to 221021212211212 its reverse (212112212120122), we get a palindrome (433133424331334).

The spelling of 221021212211212 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twelve million, two hundred eleven thousand, two hundred twelve".