21126033885 has 16 divisors (see below), whose sum is σ = 36874532160. Its totient is φ = 10242925440.

The previous prime is 21126033881. The next prime is 21126033911. The reversal of 21126033885 is 58833062112.

It is not a de Polignac number, because 21126033885 - 2² = 21126033881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21126033881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64018120 + ... + 64018449.

It is an arithmetic number, because the mean of its divisors is an integer number (2304658260).

Almost surely, 2^21126033885 is an apocalyptic number.

It is an amenable number.

21126033885 is a deficient number, since it is larger than the sum of its proper divisors (15748498275).

21126033885 is a wasteful number, since it uses less digits than its factorization.

21126033885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128036588.

The product of its (nonzero) digits is 69120, while the sum is 39.

Adding to 21126033885 its reverse (58833062112), we get a palindrome (79959095997).

The spelling of 21126033885 in words is "twenty-one billion, one hundred twenty-six million, thirty-three thousand, eight hundred eighty-five".