221112121100 has 72 divisors (see below), whose sum is σ = 534540110160. Its totient is φ = 78826164480.

The previous prime is 221112121099. The next prime is 221112121123. The reversal of 221112121100 is 1121211122.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2894822 + ... + 2970221.

Almost surely, 2^221112121100 is an apocalyptic number.

221112121100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112121100 is an abundant number, since it is smaller than the sum of its proper divisors (313427989060).

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

221112121100 is a wasteful number, since it uses less digits than its factorization.

221112121100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5865099 (or 5865092 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 221112121100 its reverse (1121211122), we get a palindrome (222233332222).

The spelling of 221112121100 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, one hundred".