21331052343 has 12 divisors (see below), whose sum is σ = 30859150608. Its totient is φ = 14198718240.

The previous prime is 21331052339. The next prime is 21331052371. The reversal of 21331052343 is 34325013312.

21331052343 is a `hidden beast` number, since 2 + 1 + 3 + 310 + 5 + 2 + 343 = 666.

It is not a de Polignac number, because 21331052343 - 2² = 21331052339 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331054343) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1825798 + ... + 1837443.

It is an arithmetic number, because the mean of its divisors is an integer number (2571595884).

Almost surely, 2^21331052343 is an apocalyptic number.

21331052343 is a deficient number, since it is larger than the sum of its proper divisors (9528098265).

21331052343 is a wasteful number, since it uses less digits than its factorization.

21331052343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3663894 (or 3663891 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 27.

Adding to 21331052343 its reverse (34325013312), we get a palindrome (55656065655).

The spelling of 21331052343 in words is "twenty-one billion, three hundred thirty-one million, fifty-two thousand, three hundred forty-three".