126501000121 has 2 divisors, whose sum is σ = 126501000122. Its totient is φ = 126501000120.

The previous prime is 126501000077. The next prime is 126501000139. The reversal of 126501000121 is 121000105621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 92696500521 + 33804499600 = 304461^2 + 183860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126501000121 is a prime.

It is a super-2 number, since 2×126501000121² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126501000181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63250500060 + 63250500061.

It is an arithmetic number, because the mean of its divisors is an integer number (63250500061).

Almost surely, 2^126501000121 is an apocalyptic number.

It is an amenable number.

126501000121 is a deficient number, since it is larger than the sum of its proper divisors (1).

126501000121 is an equidigital number, since it uses as much as digits as its factorization.

126501000121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 126501000121 its reverse (121000105621), we get a palindrome (247501105742).

The spelling of 126501000121 in words is "one hundred twenty-six billion, five hundred one million, one hundred twenty-one", and thus it is an aban number.