21004334343223 has 16 divisors (see below), whose sum is σ = 26894984799744. Its totient is φ = 15924662048160.

The previous prime is 21004334343203. The next prime is 21004334343247. The reversal of 21004334343223 is 32234343340012.

It is a cyclic number.

It is not a de Polignac number, because 21004334343223 - 2²¹ = 21004332246071 is a prime.

It is a super-2 number, since 2×21004334343223² (a number of 27 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 (21004334343203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3686261515 + ... + 3686267212.

It is an arithmetic number, because the mean of its divisors is an integer number (1680936549984).

Almost surely, 2^{21004334343223} is an apocalyptic number.

21004334343223 is a deficient number, since it is larger than the sum of its proper divisors (5890650456521).

21004334343223 is a wasteful number, since it uses less digits than its factorization.

21004334343223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7372528782.

The product of its (nonzero) digits is 124416, while the sum is 34.

Adding to 21004334343223 its reverse (32234343340012), we get a palindrome (53238677683235).

The spelling of 21004334343223 in words is "twenty-one trillion, four billion, three hundred thirty-four million, three hundred forty-three thousand, two hundred twenty-three".