21055205135 has 16 divisors (see below), whose sum is σ = 25640608320. Its totient is φ = 16594932480.

The previous prime is 21055205107. The next prime is 21055205147. The reversal of 21055205135 is 53150255012.

It is not a de Polignac number, because 21055205135 - 2⁸ = 21055204879 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21055205098 and 21055205107.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488021 + ... + 529409.

It is an arithmetic number, because the mean of its divisors is an integer number (1602538020).

Almost surely, 2^21055205135 is an apocalyptic number.

21055205135 is a deficient number, since it is larger than the sum of its proper divisors (4585403185).

21055205135 is a wasteful number, since it uses less digits than its factorization.

21055205135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42898.

The product of its (nonzero) digits is 7500, while the sum is 29.

The spelling of 21055205135 in words is "twenty-one billion, fifty-five million, two hundred five thousand, one hundred thirty-five".