121221211225 has 12 divisors (see below), whose sum is σ = 150429349584. Its totient is φ = 96902744720.

The previous prime is 121221211159. The next prime is 121221211249. The reversal of 121221211225 is 522112122121.

It is not a de Polignac number, because 121221211225 - 2¹¹ = 121221209177 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121221211196 and 121221211205.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1822279 + ... + 1887628.

It is an arithmetic number, because the mean of its divisors is an integer number (12535779132).

Almost surely, 2^121221211225 is an apocalyptic number.

It is an amenable number.

121221211225 is a deficient number, since it is larger than the sum of its proper divisors (29208138359).

121221211225 is a wasteful number, since it uses less digits than its factorization.

121221211225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3711224 (or 3711219 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

Adding to 121221211225 its reverse (522112122121), we get a palindrome (643333333346).

The spelling of 121221211225 in words is "one hundred twenty-one billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twenty-five".