1267952221 has 2 divisors, whose sum is σ = 1267952222. Its totient is φ = 1267952220.

The previous prime is 1267952209. The next prime is 1267952233. The reversal of 1267952221 is 1222597621.

It is a balanced prime because it is at equal distance from previous prime (1267952209) and next prime (1267952233).

It can be written as a sum of positive squares in only one way, i.e., 1267716025 + 236196 = 35605^2 + 486^2 .

It is a cyclic number.

It is not a de Polignac number, because 1267952221 - 2⁷ = 1267952093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1267952261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633976110 + 633976111.

It is an arithmetic number, because the mean of its divisors is an integer number (633976111).

Almost surely, 2^1267952221 is an apocalyptic number.

It is an amenable number.

1267952221 is a deficient number, since it is larger than the sum of its proper divisors (1).

1267952221 is an equidigital number, since it uses as much as digits as its factorization.

1267952221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 1267952221 is about 35608.3167392114. The cubic root of 1267952221 is about 1082.3497709800.

The spelling of 1267952221 in words is "one billion, two hundred sixty-seven million, nine hundred fifty-two thousand, two hundred twenty-one".