21043322326 has 16 divisors (see below), whose sum is σ = 34329628368. Its totient is φ = 9616140000.

The previous prime is 21043322309. The next prime is 21043322329. The reversal of 21043322326 is 62322334012.

It is a junction number, because it is equal to n+sod(n) for n = 21043322294 and 21043322303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21043322329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4004100 + ... + 4009351.

It is an arithmetic number, because the mean of its divisors is an integer number (2145601773).

Almost surely, 2^21043322326 is an apocalyptic number.

21043322326 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21043322326 is a deficient number, since it is larger than the sum of its proper divisors (13286306042).

21043322326 is a wasteful number, since it uses less digits than its factorization.

21043322326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8013567.

The product of its (nonzero) digits is 10368, while the sum is 28.

Adding to 21043322326 its reverse (62322334012), we get a palindrome (83365656338).

The spelling of 21043322326 in words is "twenty-one billion, forty-three million, three hundred twenty-two thousand, three hundred twenty-six".