221212102200121 has 16 divisors (see below), whose sum is σ = 239183822649600. Its totient is φ = 203924827819008.

The previous prime is 221212102200109. The next prime is 221212102200143. The reversal of 221212102200121 is 121002201212122.

It is a cyclic number.

It is not a de Polignac number, because 221212102200121 - 2¹⁹ = 221212101675833 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221212102800121) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 715793256 + ... + 716102233.

It is an arithmetic number, because the mean of its divisors is an integer number (14948988915600).

Almost surely, 2^{221212102200121} is an apocalyptic number.

It is an amenable number.

221212102200121 is a deficient number, since it is larger than the sum of its proper divisors (17971720449479).

221212102200121 is a wasteful number, since it uses less digits than its factorization.

221212102200121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1431895728.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 221212102200121 its reverse (121002201212122), we get a palindrome (342214303412243).

The spelling of 221212102200121 in words is "two hundred twenty-one trillion, two hundred twelve billion, one hundred two million, two hundred thousand, one hundred twenty-one".