21113021133 has 6 divisors (see below), whose sum is σ = 30496586094. Its totient is φ = 14075347416.

The previous prime is 21113021129. The next prime is 21113021183. The reversal of 21113021133 is 33112031112.

It can be written as a sum of positive squares in only one way, i.e., 21110055849 + 2965284 = 145293^2 + 1722^2 .

It is not a de Polignac number, because 21113021133 - 2² = 21113021129 is a prime.

It is a super-2 number, since 2×21113021133² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113021183) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 1172945610 + ... + 1172945627.

It is an arithmetic number, because the mean of its divisors is an integer number (5082764349).

Almost surely, 2^21113021133 is an apocalyptic number.

It is an amenable number.

21113021133 is a deficient number, since it is larger than the sum of its proper divisors (9383564961).

21113021133 is a wasteful number, since it uses less digits than its factorization.

21113021133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345891243 (or 2345891240 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 21113021133 its reverse (33112031112), we get a palindrome (54225052245).

The spelling of 21113021133 in words is "twenty-one billion, one hundred thirteen million, twenty-one thousand, one hundred thirty-three".