221208912122 has 16 divisors (see below), whose sum is σ = 362020230144. Its totient is φ = 100537836000.

The previous prime is 221208912121. The next prime is 221208912131. The reversal of 221208912122 is 221219802122.

221208912122 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221208912122³ (a number of 35 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (221208912121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388154 + ... + 770117.

It is an arithmetic number, because the mean of its divisors is an integer number (22626264384).

Almost surely, 2^221208912122 is an apocalyptic number.

221208912122 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221208912122 is a deficient number, since it is larger than the sum of its proper divisors (140811318022).

221208912122 is a wasteful number, since it uses less digits than its factorization.

221208912122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1166965.

The product of its (nonzero) digits is 4608, while the sum is 32.

Subtracting 221208912122 from its reverse (221219802122), we obtain a square (10890000 = 3300²).

The spelling of 221208912122 in words is "two hundred twenty-one billion, two hundred eight million, nine hundred twelve thousand, one hundred twenty-two".