121211001221 has 4 divisors (see below), whose sum is σ = 121213485792. Its totient is φ = 121208516652.

The previous prime is 121211001179. The next prime is 121211001229. The reversal of 121211001221 is 122100112121.

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 121211001221 - 2²⁶ = 121143892357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121211001196 and 121211001205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211001229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1167611 + ... + 1267176.

It is an arithmetic number, because the mean of its divisors is an integer number (30303371448).

Almost surely, 2^121211001221 is an apocalyptic number.

It is an amenable number.

121211001221 is a deficient number, since it is larger than the sum of its proper divisors (2484571).

121211001221 is an equidigital number, since it uses as much as digits as its factorization.

121211001221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484570.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 121211001221 its reverse (122100112121), we get a palindrome (243311113342).

The spelling of 121211001221 in words is "one hundred twenty-one billion, two hundred eleven million, one thousand, two hundred twenty-one".