19347421 has 2 divisors, whose sum is σ = 19347422. Its totient is φ = 19347420.

The previous prime is 19347407. The next prime is 19347467. The reversal of 19347421 is 12474391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19263321 + 84100 = 4389^2 + 290^2 .

It is a cyclic number.

It is not a de Polignac number, because 19347421 - 2²³ = 10958813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19347401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9673710 + 9673711.

It is an arithmetic number, because the mean of its divisors is an integer number (9673711).

Almost surely, 2^19347421 is an apocalyptic number.

It is an amenable number.

19347421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19347421 is an equidigital number, since it uses as much as digits as its factorization.

19347421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048, while the sum is 31.

The square root of 19347421 is about 4398.5703359160. The cubic root of 19347421 is about 268.4567700631.

The spelling of 19347421 in words is "nineteen million, three hundred forty-seven thousand, four hundred twenty-one".