121001221221 has 4 divisors (see below), whose sum is σ = 161334961632. Its totient is φ = 80667480812.

The previous prime is 121001221199. The next prime is 121001221279. The reversal of 121001221221 is 122122100121.

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.

It is a cyclic number.

It is not a de Polignac number, because 121001221221 - 2⁵ = 121001221189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121001221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001221021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20166870201 + ... + 20166870206.

It is an arithmetic number, because the mean of its divisors is an integer number (40333740408).

Almost surely, 2^121001221221 is an apocalyptic number.

It is an amenable number.

121001221221 is a deficient number, since it is larger than the sum of its proper divisors (40333740411).

121001221221 is an equidigital number, since it uses as much as digits as its factorization.

121001221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40333740410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 121001221221 its reverse (122122100121), we get a palindrome (243123321342).

It can be divided in two parts, 12100 and 1221221, that added together give a palindrome (1233321).

The spelling of 121001221221 in words is "one hundred twenty-one billion, one million, two hundred twenty-one thousand, two hundred twenty-one".