221201121212102 has 4 divisors (see below), whose sum is σ = 331801681818156. Its totient is φ = 110600560606050.

The previous prime is 221201121212101. The next prime is 221201121212153. The reversal of 221201121212102 is 201212121102122.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221201121212101) 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 as a sum of consecutive naturals, namely, 55300280303024 + ... + 55300280303027.

It is an arithmetic number, because the mean of its divisors is an integer number (82950420454539).

Almost surely, 2^{221201121212102} is an apocalyptic number.

221201121212102 is a deficient number, since it is larger than the sum of its proper divisors (110600560606054).

221201121212102 is a wasteful number, since it uses less digits than its factorization.

221201121212102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110600560606053.

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

Adding to 221201121212102 its reverse (201212121102122), we get a palindrome (422413242314224).

The spelling of 221201121212102 in words is "two hundred twenty-one trillion, two hundred one billion, one hundred twenty-one million, two hundred twelve thousand, one hundred two".