19385221085 has 24 divisors (see below), whose sum is σ = 24035572440. Its totient is φ = 15007773312.

The previous prime is 19385221069. The next prime is 19385221087. The reversal of 19385221085 is 58012258391.

It can be written as a sum of positive squares in 4 ways, for example, as 839956324 + 18545264761 = 28982^2 + 136181^2 .

It is not a de Polignac number, because 19385221085 - 2⁴ = 19385221069 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19385221087) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 998087 + ... + 1017323.

It is an arithmetic number, because the mean of its divisors is an integer number (1001482185).

Almost surely, 2^19385221085 is an apocalyptic number.

It is an amenable number.

19385221085 is a deficient number, since it is larger than the sum of its proper divisors (4650351355).

19385221085 is a wasteful number, since it uses less digits than its factorization.

19385221085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19437 (or 19394 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 44.

The spelling of 19385221085 in words is "nineteen billion, three hundred eighty-five million, two hundred twenty-one thousand, eighty-five".