21420334442331 has 48 divisors (see below), whose sum is σ = 35569508113152. Its totient is φ = 12294638664000.

The previous prime is 21420334442323. The next prime is 21420334442363. The reversal of 21420334442331 is 13324443302412.

21420334442331 is a `hidden beast` number, since 2 + 1 + 4 + 203 + 3 + 4 + 442 + 3 + 3 + 1 = 666.

It is not a de Polignac number, because 21420334442331 - 2³ = 21420334442323 is a prime.

It is a super-2 number, since 2×21420334442331² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21420334447331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46340625 + ... + 46800578.

It is an arithmetic number, because the mean of its divisors is an integer number (741031419024).

Almost surely, 2^{21420334442331} is an apocalyptic number.

21420334442331 is a deficient number, since it is larger than the sum of its proper divisors (14149173670821).

21420334442331 is a wasteful number, since it uses less digits than its factorization.

21420334442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93141344 (or 93141341 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 36.

Adding to 21420334442331 its reverse (13324443302412), we get a palindrome (34744777744743).

The spelling of 21420334442331 in words is "twenty-one trillion, four hundred twenty billion, three hundred thirty-four million, four hundred forty-two thousand, three hundred thirty-one".