21194442331 has 8 divisors (see below), whose sum is σ = 21940735680. Its totient is φ = 20449179072.

The previous prime is 21194442329. The next prime is 21194442377. The reversal of 21194442331 is 13324449112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21194442331 - 2¹ = 21194442329 is a prime.

It is a super-2 number, since 2×21194442331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21194412331) 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 7 ways as a sum of consecutive naturals, for example, 215530 + ... + 298063.

It is an arithmetic number, because the mean of its divisors is an integer number (2742591960).

Almost surely, 2^21194442331 is an apocalyptic number.

21194442331 is a deficient number, since it is larger than the sum of its proper divisors (746293349).

21194442331 is a wasteful number, since it uses less digits than its factorization.

21194442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515045.

The product of its digits is 20736, while the sum is 34.

The spelling of 21194442331 in words is "twenty-one billion, one hundred ninety-four million, four hundred forty-two thousand, three hundred thirty-one".