221121212212100 has 36 divisors (see below), whose sum is σ = 480274459467264. Its totient is φ = 88367115490080.

The previous prime is 221121212212097. The next prime is 221121212212141. The reversal of 221121212212100 is 1212212121122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017008192 + ... + 1017225591.

It is an arithmetic number, because the mean of its divisors is an integer number (13340957207424).

Almost surely, 2^{221121212212100} is an apocalyptic number.

221121212212100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221121212212100 is an abundant number, since it is smaller than the sum of its proper divisors (259153247255164).

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

221121212212100 is a wasteful number, since it uses less digits than its factorization.

221121212212100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034234884 (or 2034234877 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 221121212212100 its reverse (1212212121122), we get a palindrome (222333424333222).

The spelling of 221121212212100 in words is "two hundred twenty-one trillion, one hundred twenty-one billion, two hundred twelve million, two hundred twelve thousand, one hundred".