21032311105 has 24 divisors (see below), whose sum is σ = 27503806392. Its totient is φ = 15432528384.

The previous prime is 21032311081. The next prime is 21032311109. The reversal of 21032311105 is 50111323012.

It can be written as a sum of positive squares in 12 ways, for example, as 12976171569 + 8056139536 = 113913^2 + 89756^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21032311105 is a prime.

It is a super-2 number, since 2×21032311105² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21032311109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53397 + ... + 211933.

It is an arithmetic number, because the mean of its divisors is an integer number (1145991933).

Almost surely, 2^21032311105 is an apocalyptic number.

It is an amenable number.

21032311105 is a deficient number, since it is larger than the sum of its proper divisors (6471495287).

21032311105 is a wasteful number, since it uses less digits than its factorization.

21032311105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158725 (or 158712 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

Adding to 21032311105 its reverse (50111323012), we get a palindrome (71143634117).

The spelling of 21032311105 in words is "twenty-one billion, thirty-two million, three hundred eleven thousand, one hundred five".