19475477221 has 2 divisors, whose sum is σ = 19475477222. Its totient is φ = 19475477220.

The previous prime is 19475477173. The next prime is 19475477237. The reversal of 19475477221 is 12277457491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11816777025 + 7658700196 = 108705^2 + 87514^2 .

It is a cyclic number.

It is not a de Polignac number, because 19475477221 - 2⁷ = 19475477093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19475477521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9737738610 + 9737738611.

It is an arithmetic number, because the mean of its divisors is an integer number (9737738611).

Almost surely, 2^19475477221 is an apocalyptic number.

It is an amenable number.

19475477221 is a deficient number, since it is larger than the sum of its proper divisors (1).

19475477221 is an equidigital number, since it uses as much as digits as its factorization.

19475477221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 987840, while the sum is 49.

The spelling of 19475477221 in words is "nineteen billion, four hundred seventy-five million, four hundred seventy-seven thousand, two hundred twenty-one".