21115334515426 has 4 divisors (see below), whose sum is σ = 31673001773142. Its totient is φ = 10557667257712.

The previous prime is 21115334515349. The next prime is 21115334515427. The reversal of 21115334515426 is 62451543351112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 19665224833401 + 1450109682025 = 4434549^2 + 1204205^2 .

It is a super-2 number, since 2×21115334515426² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21115334515427) 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 as a sum of consecutive naturals, namely, 5278833628855 + ... + 5278833628858.

Almost surely, 2^{21115334515426} is an apocalyptic number.

21115334515426 is a deficient number, since it is larger than the sum of its proper divisors (10557667257716).

21115334515426 is a wasteful number, since it uses less digits than its factorization.

21115334515426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10557667257715.

The product of its digits is 432000, while the sum is 43.

Adding to 21115334515426 its reverse (62451543351112), we get a palindrome (83566877866538).

The spelling of 21115334515426 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-four million, five hundred fifteen thousand, four hundred twenty-six".