19419221 has 2 divisors, whose sum is σ = 19419222. Its totient is φ = 19419220.

The previous prime is 19419217. The next prime is 19419229. The reversal of 19419221 is 12291491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 972196 = 4295^2 + 986^2 .

It is an emirp because it is prime and its reverse (12291491) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 19419221 - 2² = 19419217 is a prime.

It is a super-2 number, since 2×19419221² = 754212288493682, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19419229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9709610 + 9709611.

It is an arithmetic number, because the mean of its divisors is an integer number (9709611).

Almost surely, 2^19419221 is an apocalyptic number.

It is an amenable number.

19419221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19419221 is an equidigital number, since it uses as much as digits as its factorization.

19419221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1296, while the sum is 29.

The square root of 19419221 is about 4406.7245205481. The cubic root of 19419221 is about 268.7884490870.

The spelling of 19419221 in words is "nineteen million, four hundred nineteen thousand, two hundred twenty-one".