21420313232 has 20 divisors (see below), whose sum is σ = 41731154556. Its totient is φ = 10650983040.

The previous prime is 21420313223. The next prime is 21420313237. The reversal of 21420313232 is 23231302412.

It can be written as a sum of positive squares in 2 ways, for example, as 527345296 + 20892967936 = 22964^2 + 144544^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21420313198 and 21420313207.

It is not an unprimeable number, because it can be changed into a prime (21420313237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3695363 + ... + 3701154.

Almost surely, 2^21420313232 is an apocalyptic number.

It is an amenable number.

21420313232 is a deficient number, since it is larger than the sum of its proper divisors (20310841324).

21420313232 is a wasteful number, since it uses less digits than its factorization.

21420313232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7396706 (or 7396700 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21420313232 its reverse (23231302412), we get a palindrome (44651615644).

The spelling of 21420313232 in words is "twenty-one billion, four hundred twenty million, three hundred thirteen thousand, two hundred thirty-two".