126922021 has 2 divisors, whose sum is σ = 126922022. Its totient is φ = 126922020.

The previous prime is 126922007. The next prime is 126922049. The reversal of 126922021 is 120229621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121859521 + 5062500 = 11039^2 + 2250^2 .

It is a cyclic number.

It is not a de Polignac number, because 126922021 - 2¹¹ = 126919973 is a prime.

It is a super-2 number, since 2×126922021² = 32218398829448882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126922421) 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, 63461010 + 63461011.

It is an arithmetic number, because the mean of its divisors is an integer number (63461011).

Almost surely, 2^126922021 is an apocalyptic number.

It is an amenable number.

126922021 is a deficient number, since it is larger than the sum of its proper divisors (1).

126922021 is an equidigital number, since it uses as much as digits as its factorization.

126922021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 126922021 is about 11265.9673796794. The cubic root of 126922021 is about 502.5496709231.

The spelling of 126922021 in words is "one hundred twenty-six million, nine hundred twenty-two thousand, twenty-one".