1267281321 has 4 divisors (see below), whose sum is σ = 1689708432. Its totient is φ = 844854212.

The previous prime is 1267281317. The next prime is 1267281329. The reversal of 1267281321 is 1231827621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1231827621 = 3 ⋅410609207.

It is a cyclic number.

It is not a de Polignac number, because 1267281321 - 2² = 1267281317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1267281329) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211213551 + ... + 211213556.

It is an arithmetic number, because the mean of its divisors is an integer number (422427108).

Almost surely, 2^1267281321 is an apocalyptic number.

It is an amenable number.

1267281321 is a deficient number, since it is larger than the sum of its proper divisors (422427111).

1267281321 is an equidigital number, since it uses as much as digits as its factorization.

1267281321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422427110.

The product of its digits is 8064, while the sum is 33.

The square root of 1267281321 is about 35598.8949407141. The cubic root of 1267281321 is about 1082.1588393449.

The spelling of 1267281321 in words is "one billion, two hundred sixty-seven million, two hundred eighty-one thousand, three hundred twenty-one".