1212542452121 has 180 divisors, whose sum is σ = 1715526696060. Its totient is φ = 853932119040.

The previous prime is 1212542452063. The next prime is 1212542452133.

1212542452121 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 6 ways, for example, as 114785440000 + 1097757012121 = 338800^2 + 1047739^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1212542452121 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212542452721) by changing a digit.

It is a polite number, since it can be written in 179 ways as a sum of consecutive naturals, for example, 8850674765 + ... + 8850674901.

It is an arithmetic number, because the mean of its divisors is an integer number (9530703867).

Almost surely, 2^{1212542452121} is an apocalyptic number.

1212542452121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212542452121 is a deficient number, since it is larger than the sum of its proper divisors (502984243939).

1212542452121 is an equidigital number, since it uses as much as digits as its factorization.

1212542452121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 241 counting only the distinct ones).

The product of its digits is 12800, while the sum is 32.

The spelling of 1212542452121 in words is "one trillion, two hundred twelve billion, five hundred forty-two million, four hundred fifty-two thousand, one hundred twenty-one".