21266233426 has 16 divisors (see below), whose sum is σ = 33116788440. Its totient is φ = 10229914240.

The previous prime is 21266233409. The next prime is 21266233441. The reversal of 21266233426 is 62433266212.

It can be written as a sum of positive squares in 4 ways, for example, as 14858391025 + 6407842401 = 121895^2 + 80049^2 .

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 636121 + ... + 668716.

Almost surely, 2^21266233426 is an apocalyptic number.

21266233426 is a deficient number, since it is larger than the sum of its proper divisors (11850555014).

21266233426 is a wasteful number, since it uses less digits than its factorization.

21266233426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1305149.

The product of its digits is 124416, while the sum is 37.

Adding to 21266233426 its reverse (62433266212), we get a palindrome (83699499638).

The spelling of 21266233426 in words is "twenty-one billion, two hundred sixty-six million, two hundred thirty-three thousand, four hundred twenty-six".