21004334343224 has 16 divisors (see below), whose sum is σ = 39666458743800. Its totient is φ = 10426612011552.

The previous prime is 21004334343203. The next prime is 21004334343247. The reversal of 21004334343224 is 42234343340012.

It is a super-2 number, since 2×21004334343224² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9444393827 + ... + 9444396050.

Almost surely, 2^{21004334343224} is an apocalyptic number.

It is an amenable number.

21004334343224 is a deficient number, since it is larger than the sum of its proper divisors (18662124400576).

21004334343224 is a wasteful number, since it uses less digits than its factorization.

21004334343224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18888790022 (or 18888790018 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 35.

Adding to 21004334343224 its reverse (42234343340012), we get a palindrome (63238677683236).

The spelling of 21004334343224 in words is "twenty-one trillion, four billion, three hundred thirty-four million, three hundred forty-three thousand, two hundred twenty-four".