21321043432123 has 16 divisors (see below), whose sum is σ = 22961723304960. Its totient is φ = 19726207312896.

The previous prime is 21321043432121. The next prime is 21321043432151. The reversal of 21321043432123 is 32123434012312.

It is a cyclic number.

It is not a de Polignac number, because 21321043432123 - 2¹ = 21321043432121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21321043432121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45064786 + ... + 45535447.

It is an arithmetic number, because the mean of its divisors is an integer number (1435107706560).

Almost surely, 2^{21321043432123} is an apocalyptic number.

21321043432123 is a deficient number, since it is larger than the sum of its proper divisors (1640679872837).

21321043432123 is a wasteful number, since it uses less digits than its factorization.

21321043432123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90600486.

The product of its (nonzero) digits is 20736, while the sum is 31.

Adding to 21321043432123 its reverse (32123434012312), we get a palindrome (53444477444435).

The spelling of 21321043432123 in words is "twenty-one trillion, three hundred twenty-one billion, forty-three million, four hundred thirty-two thousand, one hundred twenty-three".