221222111120100 has 54 divisors (see below), whose sum is σ = 693408417191490. Its totient is φ = 58992562965120.

The previous prime is 221222111120093. The next prime is 221222111120149. The reversal of 221222111120100 is 1021111222122.

221222111120100 is a `hidden beast` number, since 2 + 212 + 221 + 11 + 120 + 100 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 35343571942116 + 185878539177984 = 5945046^2 + 13633728^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 122901171945 + ... + 122901173744.

Almost surely, 2^{221222111120100} is an apocalyptic number.

221222111120100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222111120100 is an abundant number, since it is smaller than the sum of its proper divisors (472186306071390).

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

221222111120100 is a wasteful number, since it uses less digits than its factorization.

221222111120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245802345709 (or 245802345699 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 221222111120100 its reverse (1021111222122), we get a palindrome (222243222342222).

The spelling of 221222111120100 in words is "two hundred twenty-one trillion, two hundred twenty-two billion, one hundred eleven million, one hundred twenty thousand, one hundred".