19351421 has 2 divisors, whose sum is σ = 19351422. Its totient is φ = 19351420.

The previous prime is 19351417. The next prime is 19351427. The reversal of 19351421 is 12415391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17131321 + 2220100 = 4139^2 + 1490^2 .

It is a cyclic number.

It is not a de Polignac number, because 19351421 - 2² = 19351417 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19351427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9675710 + 9675711.

It is an arithmetic number, because the mean of its divisors is an integer number (9675711).

Almost surely, 2^19351421 is an apocalyptic number.

It is an amenable number.

19351421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19351421 is an equidigital number, since it uses as much as digits as its factorization.

19351421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 19351421 is about 4399.0250056120. The cubic root of 19351421 is about 268.4752695672.

The spelling of 19351421 in words is "nineteen million, three hundred fifty-one thousand, four hundred twenty-one".