1273421 has 2 divisors, whose sum is σ = 1273422. Its totient is φ = 1273420.

The previous prime is 1273417. The next prime is 1273423. The reversal of 1273421 is 1243721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1060900 + 212521 = 1030^2 + 461^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273421 - 2² = 1273417 is a prime.

Together with 1273423, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1273393 and 1273402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1273423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636710 + 636711.

It is an arithmetic number, because the mean of its divisors is an integer number (636711).

2^1273421 is an apocalyptic number.

It is an amenable number.

1273421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273421 is an equidigital number, since it uses as much as digits as its factorization.

1273421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 20.

The square root of 1273421 is about 1128.4595695017. The cubic root of 1273421 is about 108.3903626096.

The spelling of 1273421 in words is "one million, two hundred seventy-three thousand, four hundred twenty-one".