121201122221 has 4 divisors (see below), whose sum is σ = 121944687552. Its totient is φ = 120457556892.

The previous prime is 121201122199. The next prime is 121201122269. The reversal of 121201122221 is 122221102121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122221102121 = 137 ⋅892124833.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121201122221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121201122221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121201122281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 371782421 + ... + 371782746.

It is an arithmetic number, because the mean of its divisors is an integer number (30486171888).

Almost surely, 2^121201122221 is an apocalyptic number.

It is an amenable number.

121201122221 is a deficient number, since it is larger than the sum of its proper divisors (743565331).

121201122221 is an equidigital number, since it uses as much as digits as its factorization.

121201122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743565330.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 121201122221 its reverse (122221102121), we get a palindrome (243422224342).

The spelling of 121201122221 in words is "one hundred twenty-one billion, two hundred one million, one hundred twenty-two thousand, two hundred twenty-one".