126198307621 has 2 divisors, whose sum is σ = 126198307622. Its totient is φ = 126198307620.

The previous prime is 126198307601. The next prime is 126198307691. The reversal of 126198307621 is 126703891621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124760836225 + 1437471396 = 353215^2 + 37914^2 .

It is an emirp because it is prime and its reverse (126703891621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 126198307621 - 2⁵ = 126198307589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126198307601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63099153810 + 63099153811.

It is an arithmetic number, because the mean of its divisors is an integer number (63099153811).

Almost surely, 2^126198307621 is an apocalyptic number.

It is an amenable number.

126198307621 is a deficient number, since it is larger than the sum of its proper divisors (1).

126198307621 is an equidigital number, since it uses as much as digits as its factorization.

126198307621 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The spelling of 126198307621 in words is "one hundred twenty-six billion, one hundred ninety-eight million, three hundred seven thousand, six hundred twenty-one".