21310433344403 has 24 divisors (see below), whose sum is σ = 24815163244752. Its totient is φ = 18247318274304.

The previous prime is 21310433344399. The next prime is 21310433344481. The reversal of 21310433344403 is 30444333401312.

It is not a de Polignac number, because 21310433344403 - 2² = 21310433344399 is a prime.

It is a super-2 number, since 2×21310433344403² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21310433344703) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 617981000 + ... + 618015482.

It is an arithmetic number, because the mean of its divisors is an integer number (1033965135198).

Almost surely, 2^{21310433344403} is an apocalyptic number.

21310433344403 is a deficient number, since it is larger than the sum of its proper divisors (3504729900349).

21310433344403 is a wasteful number, since it uses less digits than its factorization.

21310433344403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47091 (or 47084 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 35.

Adding to 21310433344403 its reverse (30444333401312), we get a palindrome (51754766745715).

The spelling of 21310433344403 in words is "twenty-one trillion, three hundred ten billion, four hundred thirty-three million, three hundred forty-four thousand, four hundred three".