21323431204443 has 48 divisors (see below), whose sum is σ = 32238073707840. Its totient is φ = 13555968307200.

The previous prime is 21323431204409. The next prime is 21323431204447. The reversal of 21323431204443 is 34440213432312.

21323431204443 is a `hidden beast` number, since 2 + 1 + 3 + 2 + 3 + 4 + 3 + 1 + 204 + 443 = 666.

It is not a de Polignac number, because 21323431204443 - 2¹⁰ = 21323431203419 is a prime.

It is a super-2 number, since 2×21323431204443² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21323431204398 and 21323431204407.

It is not an unprimeable number, because it can be changed into a prime (21323431204447) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107638123 + ... + 107836043.

It is an arithmetic number, because the mean of its divisors is an integer number (671626535580).

Almost surely, 2^{21323431204443} is an apocalyptic number.

21323431204443 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21323431204443 is a deficient number, since it is larger than the sum of its proper divisors (10914642503397).

21323431204443 is a wasteful number, since it uses less digits than its factorization.

21323431204443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199540 (or 199537 counting only the distinct ones).

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

Adding to 21323431204443 its reverse (34440213432312), we get a palindrome (55763644636755).

The spelling of 21323431204443 in words is "twenty-one trillion, three hundred twenty-three billion, four hundred thirty-one million, two hundred four thousand, four hundred forty-three".