21214303232 has 22 divisors (see below), whose sum is σ = 42407891418. Its totient is φ = 10607151104.

The previous prime is 21214303219. The next prime is 21214303237. The reversal of 21214303232 is 23230341212.

It can be written as a sum of positive squares in only one way, i.e., 12351210496 + 8863092736 = 111136^2 + 94144^2 .

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21214303198 and 21214303207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214303237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10357523 + ... + 10359570.

Almost surely, 2^21214303232 is an apocalyptic number.

It is an amenable number.

21214303232 is a deficient number, since it is larger than the sum of its proper divisors (21193588186).

21214303232 is an equidigital number, since it uses as much as digits as its factorization.

21214303232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20717113 (or 20717095 counting only the distinct ones).

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

Adding to 21214303232 its reverse (23230341212), we get a palindrome (44444644444).

The spelling of 21214303232 in words is "twenty-one billion, two hundred fourteen million, three hundred three thousand, two hundred thirty-two".