21304103272 has 8 divisors (see below), whose sum is σ = 39945193650. Its totient is φ = 10652051632.

The previous prime is 21304103239. The next prime is 21304103273. The reversal of 21304103272 is 27230140312.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17167812676 + 4136290596 = 131026^2 + 64314^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21304103272² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21304103273) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1331506447 + ... + 1331506462.

Almost surely, 2^21304103272 is an apocalyptic number.

It is an amenable number.

21304103272 is a deficient number, since it is larger than the sum of its proper divisors (18641090378).

21304103272 is a wasteful number, since it uses less digits than its factorization.

21304103272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2663012915 (or 2663012911 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

Adding to 21304103272 its reverse (27230140312), we get a palindrome (48534243584).

The spelling of 21304103272 in words is "twenty-one billion, three hundred four million, one hundred three thousand, two hundred seventy-two".