126541138021 has 2 divisors, whose sum is σ = 126541138022. Its totient is φ = 126541138020.

The previous prime is 126541137991. The next prime is 126541138027. The reversal of 126541138021 is 120831145621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 104943602500 + 21597535521 = 323950^2 + 146961^2 .

It is a cyclic number.

It is not a de Polignac number, because 126541138021 - 2⁹ = 126541137509 is a prime.

It is a super-2 number, since 2×126541138021² (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 (126541138027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63270569010 + 63270569011.

It is an arithmetic number, because the mean of its divisors is an integer number (63270569011).

Almost surely, 2^126541138021 is an apocalyptic number.

It is an amenable number.

126541138021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126541138021 is an equidigital number, since it uses as much as digits as its factorization.

126541138021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 34.

The spelling of 126541138021 in words is "one hundred twenty-six billion, five hundred forty-one million, one hundred thirty-eight thousand, twenty-one".