126003877921 has 2 divisors, whose sum is σ = 126003877922. Its totient is φ = 126003877920.

The previous prime is 126003877891. The next prime is 126003877943. The reversal of 126003877921 is 129778300621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70466357025 + 55537520896 = 265455^2 + 235664^2 .

It is a cyclic number.

It is not a de Polignac number, because 126003877921 - 2⁷ = 126003877793 is a prime.

It is a super-2 number, since 2×126003877921² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (126003877121) 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 as a sum of consecutive naturals, namely, 63001938960 + 63001938961.

It is an arithmetic number, because the mean of its divisors is an integer number (63001938961).

Almost surely, 2^126003877921 is an apocalyptic number.

It is an amenable number.

126003877921 is a deficient number, since it is larger than the sum of its proper divisors (1).

126003877921 is an equidigital number, since it uses as much as digits as its factorization.

126003877921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The spelling of 126003877921 in words is "one hundred twenty-six billion, three million, eight hundred seventy-seven thousand, nine hundred twenty-one".