19120421 has 2 divisors, whose sum is σ = 19120422. Its totient is φ = 19120420.

The previous prime is 19120313. The next prime is 19120447. The reversal of 19120421 is 12402191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16900321 + 2220100 = 4111^2 + 1490^2 .

It is an emirp because it is prime and its reverse (12402191) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19120421 - 2¹⁸ = 18858277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19120393 and 19120402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19120471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9560210 + 9560211.

It is an arithmetic number, because the mean of its divisors is an integer number (9560211).

Almost surely, 2^19120421 is an apocalyptic number.

It is an amenable number.

19120421 is a deficient number, since it is larger than the sum of its proper divisors (1).

19120421 is an equidigital number, since it uses as much as digits as its factorization.

19120421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 19120421 is about 4372.6903617796. The cubic root of 19120421 is about 267.4027177043.

The spelling of 19120421 in words is "nineteen million, one hundred twenty thousand, four hundred twenty-one".