126421 has 2 divisors, whose sum is σ = 126422. Its totient is φ = 126420.

The previous prime is 126397. The next prime is 126433. The reversal of 126421 is 124621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119025 + 7396 = 345^2 + 86^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126395 and 126404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63210 + 63211.

It is an arithmetic number, because the mean of its divisors is an integer number (63211).

2¹²⁶⁴²¹ is an apocalyptic number.

It is an amenable number.

126421 is a deficient number, since it is larger than the sum of its proper divisors (1).

126421 is an equidigital number, since it uses as much as digits as its factorization.

126421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96, while the sum is 16.

The square root of 126421 is about 355.5573090235. The cubic root of 126421 is about 50.1887532145.

The spelling of 126421 in words is "one hundred twenty-six thousand, four hundred twenty-one".