121551251225 has 24 divisors (see below), whose sum is σ = 159023051040. Its totient is φ = 91910142720.

The previous prime is 121551251221. The next prime is 121551251249. The reversal of 121551251225 is 522152155121.

It is not a de Polignac number, because 121551251225 - 2² = 121551251221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121551251191 and 121551251200.

It is not an unprimeable number, because it can be changed into a prime (121551251221) 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 23 ways as a sum of consecutive naturals, for example, 89819 + ... + 501168.

It is an arithmetic number, because the mean of its divisors is an integer number (6625960460).

Almost surely, 2^121551251225 is an apocalyptic number.

It is an amenable number.

121551251225 is a deficient number, since it is larger than the sum of its proper divisors (37471799815).

121551251225 is a wasteful number, since it uses less digits than its factorization.

121551251225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591449 (or 591444 counting only the distinct ones).

The product of its digits is 10000, while the sum is 32.

The spelling of 121551251225 in words is "one hundred twenty-one billion, five hundred fifty-one million, two hundred fifty-one thousand, two hundred twenty-five".