121201221111212 has 48 divisors (see below), whose sum is σ = 231467863334400. Its totient is φ = 55071535844160.

The previous prime is 121201221111211. The next prime is 121201221111253. The reversal of 121201221111212 is 212111122102121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121201221111211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1565484239 + ... + 1565561657.

It is an arithmetic number, because the mean of its divisors is an integer number (4822247152800).

Almost surely, 2^{121201221111212} is an apocalyptic number.

It is an amenable number.

121201221111212 is a deficient number, since it is larger than the sum of its proper divisors (110266642223188).

121201221111212 is a wasteful number, since it uses less digits than its factorization.

121201221111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89846 (or 89844 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121201221111212 its reverse (212111122102121), we get a palindrome (333312343213333).

Subtracting 121201221111212 from its reverse (212111122102121), we obtain a palindrome (90909900990909).

The spelling of 121201221111212 in words is "one hundred twenty-one trillion, two hundred one billion, two hundred twenty-one million, one hundred eleven thousand, two hundred twelve".