19140221 has 2 divisors, whose sum is σ = 19140222. Its totient is φ = 19140220.

The previous prime is 19140197. The next prime is 19140227. The reversal of 19140221 is 12204191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13039321 + 6100900 = 3611^2 + 2470^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19140221 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 19140193 and 19140202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19140227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9570110 + 9570111.

It is an arithmetic number, because the mean of its divisors is an integer number (9570111).

Almost surely, 2^19140221 is an apocalyptic number.

It is an amenable number.

19140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19140221 is an equidigital number, since it uses as much as digits as its factorization.

19140221 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 19140221 is about 4374.9538283278. The cubic root of 19140221 is about 267.4949881147.

The spelling of 19140221 in words is "nineteen million, one hundred forty thousand, two hundred twenty-one".