121239743837 has 2 divisors, whose sum is σ = 121239743838. Its totient is φ = 121239743836.

The previous prime is 121239743819. The next prime is 121239743873. The reversal of 121239743837 is 738347932121.

Together with next prime (121239743873) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72989667556 + 48250076281 = 270166^2 + 219659^2 .

It is a cyclic number.

It is not a de Polignac number, because 121239743837 - 2¹² = 121239739741 is a prime.

It is a super-2 number, since 2×121239743837² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121239742837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60619871918 + 60619871919.

It is an arithmetic number, because the mean of its divisors is an integer number (60619871919).

Almost surely, 2^121239743837 is an apocalyptic number.

It is an amenable number.

121239743837 is a deficient number, since it is larger than the sum of its proper divisors (1).

121239743837 is an equidigital number, since it uses as much as digits as its factorization.

121239743837 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 50.

The spelling of 121239743837 in words is "one hundred twenty-one billion, two hundred thirty-nine million, seven hundred forty-three thousand, eight hundred thirty-seven".