1273227421 has 2 divisors, whose sum is σ = 1273227422. Its totient is φ = 1273227420.

The previous prime is 1273227391. The next prime is 1273227433. The reversal of 1273227421 is 1247223721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888636100 + 384591321 = 29810^2 + 19611^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273227421 - 2⁹ = 1273226909 is a prime.

It is a super-2 number, since 2×1273227421² = 3242216131172622482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273227481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636613710 + 636613711.

It is an arithmetic number, because the mean of its divisors is an integer number (636613711).

Almost surely, 2^1273227421 is an apocalyptic number.

It is an amenable number.

1273227421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273227421 is an equidigital number, since it uses as much as digits as its factorization.

1273227421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9408, while the sum is 31.

The square root of 1273227421 is about 35682.3124390783. The cubic root of 1273227421 is about 1083.8487001357.

The spelling of 1273227421 in words is "one billion, two hundred seventy-three million, two hundred twenty-seven thousand, four hundred twenty-one".