21105025232 has 10 divisors (see below), whose sum is σ = 40890986418. Its totient is φ = 10552512608.

The previous prime is 21105025231. The next prime is 21105025247. The reversal of 21105025232 is 23252050112.

It can be written as a sum of positive squares in only one way, i.e., 11338842256 + 9766182976 = 106484^2 + 98824^2 .

It is a super-3 number, since 3×21105025232³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21105025198 and 21105025207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21105025231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659532023 + ... + 659532054.

Almost surely, 2^21105025232 is an apocalyptic number.

It is an amenable number.

21105025232 is a deficient number, since it is larger than the sum of its proper divisors (19785961186).

21105025232 is a wasteful number, since it uses less digits than its factorization.

21105025232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319064085 (or 1319064079 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

Adding to 21105025232 its reverse (23252050112), we get a palindrome (44357075344).

The spelling of 21105025232 in words is "twenty-one billion, one hundred five million, twenty-five thousand, two hundred thirty-two".