21275442752 has 14 divisors (see below), whose sum is σ = 42218456838. Its totient is φ = 10637721344.

The previous prime is 21275442751. The next prime is 21275442763. The reversal of 21275442752 is 25724457212.

It can be written as a sum of positive squares in only one way, i.e., 20890655296 + 384787456 = 144536^2 + 19616^2 .

It is not an unprimeable number, because it can be changed into a prime (21275442751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 166214333 + ... + 166214460.

Almost surely, 2^21275442752 is an apocalyptic number.

It is an amenable number.

21275442752 is a deficient number, since it is larger than the sum of its proper divisors (20943014086).

21275442752 is an equidigital number, since it uses as much as digits as its factorization.

21275442752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332428805 (or 332428795 counting only the distinct ones).

The product of its digits is 313600, while the sum is 41.

Adding to 21275442752 its reverse (25724457212), we get a palindrome (46999899964).

The spelling of 21275442752 in words is "twenty-one billion, two hundred seventy-five million, four hundred forty-two thousand, seven hundred fifty-two".