19470361221 has 24 divisors (see below), whose sum is σ = 28519971480. Its totient is φ = 12797554176.

The previous prime is 19470361213. The next prime is 19470361231. The reversal of 19470361221 is 12216307491.

19470361221 is a `hidden beast` number, since 1 + 9 + 4 + 70 + 361 + 221 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 4016390625 + 15453970596 = 63375^2 + 124314^2 .

It is not a de Polignac number, because 19470361221 - 2³ = 19470361213 is a prime.

It is a super-2 number, since 2×19470361221² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19470361231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2727585 + ... + 2734713.

It is an arithmetic number, because the mean of its divisors is an integer number (1188332145).

Almost surely, 2^19470361221 is an apocalyptic number.

It is an amenable number.

19470361221 is a deficient number, since it is larger than the sum of its proper divisors (9049610259).

19470361221 is a wasteful number, since it uses less digits than its factorization.

19470361221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11365 (or 11362 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The spelling of 19470361221 in words is "nineteen billion, four hundred seventy million, three hundred sixty-one thousand, two hundred twenty-one".