21041314521 has 16 divisors (see below), whose sum is σ = 28930197504. Its totient is φ = 13595783184.

The previous prime is 21041314471. The next prime is 21041314531. The reversal of 21041314521 is 12541314012.

It is not a de Polignac number, because 21041314521 - 2¹⁵ = 21041281753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21041314491 and 21041314500.

It is not an unprimeable number, because it can be changed into a prime (21041314531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 709891 + ... + 738936.

It is an arithmetic number, because the mean of its divisors is an integer number (1808137344).

Almost surely, 2^21041314521 is an apocalyptic number.

It is an amenable number.

21041314521 is a deficient number, since it is larger than the sum of its proper divisors (7888882983).

21041314521 is a wasteful number, since it uses less digits than its factorization.

21041314521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448980.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 21041314521 its reverse (12541314012), we get a palindrome (33582628533).

The spelling of 21041314521 in words is "twenty-one billion, forty-one million, three hundred fourteen thousand, five hundred twenty-one".