21131144343 has 6 divisors (see below), whose sum is σ = 30522764064. Its totient is φ = 14087429556.

The previous prime is 21131144341. The next prime is 21131144369. The reversal of 21131144343 is 34344113112.

21131144343 is a `hidden beast` number, since 2 + 1 + 1 + 311 + 4 + 4 + 343 = 666.

It is not a de Polignac number, because 21131144343 - 2¹ = 21131144341 is a prime.

It is a super-2 number, since 2×21131144343² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21131144341) 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 5 ways as a sum of consecutive naturals, for example, 1173952455 + ... + 1173952472.

It is an arithmetic number, because the mean of its divisors is an integer number (5087127344).

Almost surely, 2^21131144343 is an apocalyptic number.

21131144343 is a deficient number, since it is larger than the sum of its proper divisors (9391619721).

21131144343 is a wasteful number, since it uses less digits than its factorization.

21131144343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2347904933 (or 2347904930 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

Adding to 21131144343 its reverse (34344113112), we get a palindrome (55475257455).

The spelling of 21131144343 in words is "twenty-one billion, one hundred thirty-one million, one hundred forty-four thousand, three hundred forty-three".