126402821 has 2 divisors, whose sum is σ = 126402822. Its totient is φ = 126402820.

The previous prime is 126402761. The next prime is 126402833. The reversal of 126402821 is 128204621.

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., 72012196 + 54390625 = 8486^2 + 7375^2 .

It is a cyclic number.

It is not a de Polignac number, because 126402821 - 2²² = 122208517 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126402121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63201410 + 63201411.

It is an arithmetic number, because the mean of its divisors is an integer number (63201411).

Almost surely, 2^126402821 is an apocalyptic number.

It is an amenable number.

126402821 is a deficient number, since it is larger than the sum of its proper divisors (1).

126402821 is an equidigital number, since it uses as much as digits as its factorization.

126402821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 126402821 is about 11242.9009156890. The cubic root of 126402821 is about 501.8634742991.

The spelling of 126402821 in words is "one hundred twenty-six million, four hundred two thousand, eight hundred twenty-one".