21301232220232 has 8 divisors (see below), whose sum is σ = 39939810412950. Its totient is φ = 10650616110112.

The previous prime is 21301232220197. The next prime is 21301232220239. The reversal of 21301232220232 is 23202223210312.

It can be written as a sum of positive squares in only one way, i.e., 16581884391396 + 4719347828836 = 4072086^2 + 2172406^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 21301232220197 and 21301232220206.

It is not an unprimeable number, because it can be changed into a prime (21301232220239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331327013757 + ... + 1331327013772.

Almost surely, 2^{21301232220232} is an apocalyptic number.

It is an amenable number.

21301232220232 is a deficient number, since it is larger than the sum of its proper divisors (18638578192718).

21301232220232 is a wasteful number, since it uses less digits than its factorization.

21301232220232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662654027535 (or 2662654027531 counting only the distinct ones).

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

Adding to 21301232220232 its reverse (23202223210312), we get a palindrome (44503455430544).

The spelling of 21301232220232 in words is "twenty-one trillion, three hundred one billion, two hundred thirty-two million, two hundred twenty thousand, two hundred thirty-two".