21033660055 has 12 divisors (see below), whose sum is σ = 25841040120. Its totient is φ = 16435596912.

The previous prime is 21033660047. The next prime is 21033660073. The reversal of 21033660055 is 55006633012.

It is not a de Polignac number, because 21033660055 - 2³ = 21033660047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21033659999 and 21033660026.

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 11 ways as a sum of consecutive naturals, for example, 1128325 + ... + 1146814.

It is an arithmetic number, because the mean of its divisors is an integer number (2153420010).

Almost surely, 2^21033660055 is an apocalyptic number.

21033660055 is a deficient number, since it is larger than the sum of its proper divisors (4807380065).

21033660055 is an equidigital number, since it uses as much as digits as its factorization.

21033660055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2275230 (or 2275187 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 31.

The spelling of 21033660055 in words is "twenty-one billion, thirty-three million, six hundred sixty thousand, fifty-five".