21011321133 has 128 divisors (see below), whose sum is σ = 36642816000. Its totient is φ = 11764543680.

The previous prime is 21011321129. The next prime is 21011321153. The reversal of 21011321133 is 33112311012.

21011321133 is a `hidden beast` number, since 210 + 1 + 1 + 321 + 133 = 666.

It is not a de Polignac number, because 21011321133 - 2² = 21011321129 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011321153) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 74244810 + ... + 74245092.

It is an arithmetic number, because the mean of its divisors is an integer number (286272000).

Almost surely, 2^21011321133 is an apocalyptic number.

It is an amenable number.

21011321133 is a deficient number, since it is larger than the sum of its proper divisors (15631494867).

21011321133 is a wasteful number, since it uses less digits than its factorization.

21011321133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 598 counting only the distinct ones).

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

Adding to 21011321133 its reverse (33112311012), we get a palindrome (54123632145).

The spelling of 21011321133 in words is "twenty-one billion, eleven million, three hundred twenty-one thousand, one hundred thirty-three".