21105226135 has 32 divisors (see below), whose sum is σ = 29255675904. Its totient is φ = 14316720000.

The previous prime is 21105226127. The next prime is 21105226189. The reversal of 21105226135 is 53162250112.

It is not a de Polignac number, because 21105226135 - 2³ = 21105226127 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 6612390 + ... + 6615580.

It is an arithmetic number, because the mean of its divisors is an integer number (914239872).

Almost surely, 2^21105226135 is an apocalyptic number.

21105226135 is a deficient number, since it is larger than the sum of its proper divisors (8150449769).

21105226135 is a wasteful number, since it uses less digits than its factorization.

21105226135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5175.

The product of its (nonzero) digits is 3600, while the sum is 28.

Adding to 21105226135 its reverse (53162250112), we get a palindrome (74267476247).

The spelling of 21105226135 in words is "twenty-one billion, one hundred five million, two hundred twenty-six thousand, one hundred thirty-five".