1266479021 has 2 divisors, whose sum is σ = 1266479022. Its totient is φ = 1266479020.

The previous prime is 1266479009. The next prime is 1266479033. The reversal of 1266479021 is 1209746621.

It is a balanced prime because it is at equal distance from previous prime (1266479009) and next prime (1266479033).

It can be written as a sum of positive squares in only one way, i.e., 809118025 + 457360996 = 28445^2 + 21386^2 .

It is an emirp because it is prime and its reverse (1209746621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1266479021 - 2²² = 1262284717 is a prime.

It is a super-2 number, since 2×1266479021² = 3207938221266236882, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1266470021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 633239510 + 633239511.

It is an arithmetic number, because the mean of its divisors is an integer number (633239511).

Almost surely, 2^1266479021 is an apocalyptic number.

It is an amenable number.

1266479021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1266479021 is an equidigital number, since it uses as much as digits as its factorization.

1266479021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1266479021 is about 35587.6245484298. The cubic root of 1266479021 is about 1081.9304240473.

The spelling of 1266479021 in words is "one billion, two hundred sixty-six million, four hundred seventy-nine thousand, twenty-one".