21240231343 has 16 divisors (see below), whose sum is σ = 22539912192. Its totient is φ = 19982520000.

The previous prime is 21240231319. The next prime is 21240231361. The reversal of 21240231343 is 34313204212.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21240231343 is a prime.

It is a super-2 number, since 2×21240231343² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240231143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 330168 + ... + 389218.

It is an arithmetic number, because the mean of its divisors is an integer number (1408744512).

Almost surely, 2^21240231343 is an apocalyptic number.

21240231343 is a deficient number, since it is larger than the sum of its proper divisors (1299680849).

21240231343 is a wasteful number, since it uses less digits than its factorization.

21240231343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59406.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21240231343 its reverse (34313204212), we get a palindrome (55553435555).

The spelling of 21240231343 in words is "twenty-one billion, two hundred forty million, two hundred thirty-one thousand, three hundred forty-three".