21221312103232 has 28 divisors (see below), whose sum is σ = 44327411797120. Its totient is φ = 10052200469376.

The previous prime is 21221312103227. The next prime is 21221312103239. The reversal of 21221312103232 is 23230121312212.

It is a junction number, because it is equal to n+sod(n) for n = 21221312103197 and 21221312103206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221312103239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8725867248 + ... + 8725869679.

Almost surely, 2^{21221312103232} is an apocalyptic number.

It is an amenable number.

21221312103232 is an abundant number, since it is smaller than the sum of its proper divisors (23106099693888).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221312103232 is a wasteful number, since it uses less digits than its factorization.

21221312103232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17451736958 (or 17451736948 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21221312103232 its reverse (23230121312212), we get a palindrome (44451433415444).

The spelling of 21221312103232 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred twelve million, one hundred three thousand, two hundred thirty-two".