126972221 has 2 divisors, whose sum is σ = 126972222. Its totient is φ = 126972220.

The previous prime is 126972199. The next prime is 126972229. The reversal of 126972221 is 122279621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88096996 + 38875225 = 9386^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 126972221 - 2¹⁰ = 126971197 is a prime.

It is a super-2 number, since 2×126972221² = 32243889811345682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (126972229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63486110 + 63486111.

It is an arithmetic number, because the mean of its divisors is an integer number (63486111).

Almost surely, 2^126972221 is an apocalyptic number.

It is an amenable number.

126972221 is a deficient number, since it is larger than the sum of its proper divisors (1).

126972221 is an equidigital number, since it uses as much as digits as its factorization.

126972221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 32.

The square root of 126972221 is about 11268.1951083570. The cubic root of 126972221 is about 502.6159180775.

The spelling of 126972221 in words is "one hundred twenty-six million, nine hundred seventy-two thousand, two hundred twenty-one".