121211102120221 has 16 divisors (see below), whose sum is σ = 121929090256960. Its totient is φ = 120495272526720.

The previous prime is 121211102120197. The next prime is 121211102120231. The reversal of 121211102120221 is 122021201112121.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 121211102120221 - 2²⁵ = 121211068565789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121211102120231) 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, 1786607326 + ... + 1786675168.

It is an arithmetic number, because the mean of its divisors is an integer number (7620568141060).

Almost surely, 2^{121211102120221} is an apocalyptic number.

It is an amenable number.

121211102120221 is a deficient number, since it is larger than the sum of its proper divisors (717988136739).

121211102120221 is a wasteful number, since it uses less digits than its factorization.

121211102120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83596.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121211102120221 its reverse (122021201112121), we get a palindrome (243232303232342).

The spelling of 121211102120221 in words is "one hundred twenty-one trillion, two hundred eleven billion, one hundred two million, one hundred twenty thousand, two hundred twenty-one".