221021221212122 has 24 divisors (see below), whose sum is σ = 338995757788896. Its totient is φ = 108076310282808.

The previous prime is 221021221212031. The next prime is 221021221212173. The reversal of 221021221212122 is 221212122120122.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13440368 + ... + 24953675.

It is an arithmetic number, because the mean of its divisors is an integer number (14124823241204).

Almost surely, 2^{221021221212122} is an apocalyptic number.

221021221212122 is a deficient number, since it is larger than the sum of its proper divisors (117974536576774).

221021221212122 is a wasteful number, since it uses less digits than its factorization.

221021221212122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38395442 (or 38395395 counting only the distinct ones).

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

Adding to 221021221212122 its reverse (221212122120122), we get a palindrome (442233343332244).

The spelling of 221021221212122 in words is "two hundred twenty-one trillion, twenty-one billion, two hundred twenty-one million, two hundred twelve thousand, one hundred twenty-two".