21380500340536 has 32 divisors (see below), whose sum is σ = 41715994003200. Its totient is φ = 10264662747360.

The previous prime is 21380500340503. The next prime is 21380500340593. The reversal of 21380500340536 is 63504300508312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 526696800 + ... + 526737391.

It is an arithmetic number, because the mean of its divisors is an integer number (1303624812600).

Almost surely, 2^{21380500340536} is an apocalyptic number.

It is an amenable number.

21380500340536 is a deficient number, since it is larger than the sum of its proper divisors (20335493662664).

21380500340536 is a wasteful number, since it uses less digits than its factorization.

21380500340536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1053434299 (or 1053434295 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

Adding to 21380500340536 its reverse (63504300508312), we get a palindrome (84884800848848).

The spelling of 21380500340536 in words is "twenty-one trillion, three hundred eighty billion, five hundred million, three hundred forty thousand, five hundred thirty-six".