21502204132 has 6 divisors (see below), whose sum is σ = 37628857238. Its totient is φ = 10751102064.

The previous prime is 21502204127. The next prime is 21502204133. The reversal of 21502204132 is 23140220512.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 18891402916 + 2610801216 = 137446^2 + 51096^2 .

It is not an unprimeable number, because it can be changed into a prime (21502204133) 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 as a sum of consecutive naturals, namely, 2687775513 + ... + 2687775520.

Almost surely, 2^21502204132 is an apocalyptic number.

It is an amenable number.

21502204132 is a deficient number, since it is larger than the sum of its proper divisors (16126653106).

21502204132 is a wasteful number, since it uses less digits than its factorization.

21502204132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5375551037 (or 5375551035 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

Adding to 21502204132 its reverse (23140220512), we get a palindrome (44642424644).

The spelling of 21502204132 in words is "twenty-one billion, five hundred two million, two hundred four thousand, one hundred thirty-two".