126423421 has 2 divisors, whose sum is σ = 126423422. Its totient is φ = 126423420.

The previous prime is 126423379. The next prime is 126423431. The reversal of 126423421 is 124324621.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63776196 + 62647225 = 7986^2 + 7915^2 .

It is a cyclic number.

It is not a de Polignac number, because 126423421 - 2¹⁵ = 126390653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126423431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63211710 + 63211711.

It is an arithmetic number, because the mean of its divisors is an integer number (63211711).

Almost surely, 2^126423421 is an apocalyptic number.

It is an amenable number.

126423421 is a deficient number, since it is larger than the sum of its proper divisors (1).

126423421 is an equidigital number, since it uses as much as digits as its factorization.

126423421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 25.

The square root of 126423421 is about 11243.8170120293. The cubic root of 126423421 is about 501.8907358900.

The spelling of 126423421 in words is "one hundred twenty-six million, four hundred twenty-three thousand, four hundred twenty-one".