21194463321 has 20 divisors (see below), whose sum is σ = 32516568612. Its totient is φ = 13747758048.

The previous prime is 21194463299. The next prime is 21194463337. The reversal of 21194463321 is 12336449112.

21194463321 is a `hidden beast` number, since 2 + 1 + 19 + 4 + 4 + 633 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17315664921 + 3878798400 = 131589^2 + 62280^2 .

It is not a de Polignac number, because 21194463321 - 2¹⁰ = 21194462297 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21194463341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3532950 + ... + 3538943.

Almost surely, 2^21194463321 is an apocalyptic number.

It is an amenable number.

21194463321 is a deficient number, since it is larger than the sum of its proper divisors (11322105291).

21194463321 is an equidigital number, since it uses as much as digits as its factorization.

21194463321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7071942 (or 7071933 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The spelling of 21194463321 in words is "twenty-one billion, one hundred ninety-four million, four hundred sixty-three thousand, three hundred twenty-one".