1266309421 has 16 divisors (see below), whose sum is σ = 1412346880. Its totient is φ = 1127468160.

The previous prime is 1266309419. The next prime is 1266309427. The reversal of 1266309421 is 1249036621.

It is a happy number.

It is not a de Polignac number, because 1266309421 - 2¹ = 1266309419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1266309427) 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 in 15 ways as a sum of consecutive naturals, for example, 121120 + ... + 131158.

It is an arithmetic number, because the mean of its divisors is an integer number (88271680).

Almost surely, 2^1266309421 is an apocalyptic number.

It is an amenable number.

1266309421 is a deficient number, since it is larger than the sum of its proper divisors (146037459).

1266309421 is a wasteful number, since it uses less digits than its factorization.

1266309421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10396.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1266309421 is about 35585.2416178393. The cubic root of 1266309421 is about 1081.8821264736.

The spelling of 1266309421 in words is "one billion, two hundred sixty-six million, three hundred nine thousand, four hundred twenty-one".