221222201220100 has 36 divisors (see below), whose sum is σ = 480057047484084. Its totient is φ = 88487982638080.

The previous prime is 221222201220091. The next prime is 221222201220143. The reversal of 221222201220100 is 1022102222122.

It can be written as a sum of positive squares in 6 ways, for example, as 15921504510976 + 205300696709124 = 3990176^2 + 14328318^2 .

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, 1274329 + ... + 21072928.

It is an arithmetic number, because the mean of its divisors is an integer number (13334917985669).

Almost surely, 2^{221222201220100} is an apocalyptic number.

221222201220100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222201220100 is an abundant number, since it is smaller than the sum of its proper divisors (258834846263984).

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

221222201220100 is a wasteful number, since it uses less digits than its factorization.

221222201220100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22446264 (or 22446257 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 221222201220100 its reverse (1022102222122), we get a palindrome (222244303442222).

The spelling of 221222201220100 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, two hundred one million, two hundred twenty thousand, one hundred".