21040320321232 has 10 divisors (see below), whose sum is σ = 40765620622418. Its totient is φ = 10520160160608.

The previous prime is 21040320321157. The next prime is 21040320321247. The reversal of 21040320321232 is 23212302304012.

It can be written as a sum of positive squares in only one way, i.e., 10658031032896 + 10382289288336 = 3264664^2 + 3222156^2 .

It is a super-3 number, since 3×21040320321232³ (a number of 41 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21040320321197 and 21040320321206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657510010023 + ... + 657510010054.

Almost surely, 2^{21040320321232} is an apocalyptic number.

It is an amenable number.

21040320321232 is a deficient number, since it is larger than the sum of its proper divisors (19725300301186).

21040320321232 is a wasteful number, since it uses less digits than its factorization.

21040320321232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315020020085 (or 1315020020079 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 21040320321232 its reverse (23212302304012), we get a palindrome (44252622625244).

The spelling of 21040320321232 in words is "twenty-one trillion, forty billion, three hundred twenty million, three hundred twenty-one thousand, two hundred thirty-two".