126966821 has 2 divisors, whose sum is σ = 126966822. Its totient is φ = 126966820.

The previous prime is 126966811. The next prime is 126966859. The reversal of 126966821 is 128669621.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77193796 + 49773025 = 8786^2 + 7055^2 .

It is a cyclic number.

It is not a de Polignac number, because 126966821 - 2¹⁴ = 126950437 is a prime.

It is a super-3 number, since 3×126966821³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126966811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63483410 + 63483411.

It is an arithmetic number, because the mean of its divisors is an integer number (63483411).

Almost surely, 2^126966821 is an apocalyptic number.

It is an amenable number.

126966821 is a deficient number, since it is larger than the sum of its proper divisors (1).

126966821 is an equidigital number, since it uses as much as digits as its factorization.

126966821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62208, while the sum is 41.

The square root of 126966821 is about 11267.9554933448. The cubic root of 126966821 is about 502.6087927278.

The spelling of 126966821 in words is "one hundred twenty-six million, nine hundred sixty-six thousand, eight hundred twenty-one".