126366621421 has 2 divisors, whose sum is σ = 126366621422. Its totient is φ = 126366621420.

The previous prime is 126366621401. The next prime is 126366621533. The reversal of 126366621421 is 124126663621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 100029875625 + 26336745796 = 316275^2 + 162286^2 .

It is a cyclic number.

It is not a de Polignac number, because 126366621421 - 2¹¹ = 126366619373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126366621401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63183310710 + 63183310711.

It is an arithmetic number, because the mean of its divisors is an integer number (63183310711).

Almost surely, 2^126366621421 is an apocalyptic number.

It is an amenable number.

126366621421 is a deficient number, since it is larger than the sum of its proper divisors (1).

126366621421 is an equidigital number, since it uses as much as digits as its factorization.

126366621421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 124416, while the sum is 40.

The spelling of 126366621421 in words is "one hundred twenty-six billion, three hundred sixty-six million, six hundred twenty-one thousand, four hundred twenty-one".