21328302452 has 6 divisors (see below), whose sum is σ = 37324529298. Its totient is φ = 10664151224.

The previous prime is 21328302379. The next prime is 21328302469. The reversal of 21328302452 is 25420382312.

It can be written as a sum of positive squares in only one way, i.e., 13779472996 + 7548829456 = 117386^2 + 86884^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2666037803 + ... + 2666037810.

It is an arithmetic number, because the mean of its divisors is an integer number (6220754883).

Almost surely, 2^21328302452 is an apocalyptic number.

It is an amenable number.

21328302452 is a deficient number, since it is larger than the sum of its proper divisors (15996226846).

21328302452 is a wasteful number, since it uses less digits than its factorization.

21328302452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5332075617 (or 5332075615 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 32.

Adding to 21328302452 its reverse (25420382312), we get a palindrome (46748684764).

The spelling of 21328302452 in words is "twenty-one billion, three hundred twenty-eight million, three hundred two thousand, four hundred fifty-two".