21111320426 has 24 divisors (see below), whose sum is σ = 39003991236. Its totient is φ = 8515489920.

The previous prime is 21111320401. The next prime is 21111320441. The reversal of 21111320426 is 62402311112.

It can be written as a sum of positive squares in 2 ways, for example, as 20202358225 + 908962201 = 142135^2 + 30149^2 .

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6334265 + ... + 6337596.

Almost surely, 2^21111320426 is an apocalyptic number.

21111320426 is a deficient number, since it is larger than the sum of its proper divisors (17892670810).

21111320426 is a wasteful number, since it uses less digits than its factorization.

21111320426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12671894 (or 12671887 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 21111320426 its reverse (62402311112), we get a palindrome (83513631538).

The spelling of 21111320426 in words is "twenty-one billion, one hundred eleven million, three hundred twenty thousand, four hundred twenty-six".