1240421267 has 2 divisors, whose sum is σ = 1240421268. Its totient is φ = 1240421266.

The previous prime is 1240421261. The next prime is 1240421309. The reversal of 1240421267 is 7621240421.

It is a weak prime.

It is an emirp because it is prime and its reverse (7621240421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1240421267 - 2¹⁶ = 1240355731 is a prime.

It is not a weakly prime, because it can be changed into another prime (1240421261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620210633 + 620210634.

It is an arithmetic number, because the mean of its divisors is an integer number (620210634).

Almost surely, 2^1240421267 is an apocalyptic number.

1240421267 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240421267 is an equidigital number, since it uses as much as digits as its factorization.

1240421267 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 29.

The square root of 1240421267 is about 35219.6148048215. The cubic root of 1240421267 is about 1074.4587192450.

Adding to 1240421267 its reverse (7621240421), we get a palindrome (8861661688).

The spelling of 1240421267 in words is "one billion, two hundred forty million, four hundred twenty-one thousand, two hundred sixty-seven".