126355421 has 2 divisors, whose sum is σ = 126355422. Its totient is φ = 126355420.

The previous prime is 126355417. The next prime is 126355423. The reversal of 126355421 is 124553621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89510521 + 36844900 = 9461^2 + 6070^2 .

It is a cyclic number.

It is not a de Polignac number, because 126355421 - 2² = 126355417 is a prime.

Together with 126355423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126355423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63177710 + 63177711.

It is an arithmetic number, because the mean of its divisors is an integer number (63177711).

Almost surely, 2^126355421 is an apocalyptic number.

It is an amenable number.

126355421 is a deficient number, since it is larger than the sum of its proper divisors (1).

126355421 is an equidigital number, since it uses as much as digits as its factorization.

126355421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 29.

The square root of 126355421 is about 11240.7927211563. The cubic root of 126355421 is about 501.8007349220.

The spelling of 126355421 in words is "one hundred twenty-six million, three hundred fifty-five thousand, four hundred twenty-one".