121211882125 has 8 divisors (see below), whose sum is σ = 151272429048. Its totient is φ = 96969505600.

The previous prime is 121211882089. The next prime is 121211882161. The reversal of 121211882125 is 521288112121.

It is an interprime number because it is at equal distance from previous prime (121211882089) and next prime (121211882161).

It can be written as a sum of positive squares in 4 ways, for example, as 720976201 + 120490905924 = 26851^2 + 347118^2 .

It is not a de Polignac number, because 121211882125 - 2⁷ = 121211881997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 484847404 + ... + 484847653.

It is an arithmetic number, because the mean of its divisors is an integer number (18909053631).

Almost surely, 2^121211882125 is an apocalyptic number.

It is an amenable number.

121211882125 is a deficient number, since it is larger than the sum of its proper divisors (30060546923).

121211882125 is an frugal number, since it uses more digits than its factorization.

121211882125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 969695072 (or 969695062 counting only the distinct ones).

The product of its digits is 5120, while the sum is 34.

Adding to 121211882125 its reverse (521288112121), we get a palindrome (642499994246).

The spelling of 121211882125 in words is "one hundred twenty-one billion, two hundred eleven million, eight hundred eighty-two thousand, one hundred twenty-five".