21133155235 has 16 divisors (see below), whose sum is σ = 26188185600. Its totient is φ = 16354689120.

The previous prime is 21133155223. The next prime is 21133155257. The reversal of 21133155235 is 53255133112.

It is not a de Polignac number, because 21133155235 - 2²¹ = 21131058083 is a prime.

It is a super-2 number, since 2×21133155235² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a junction number, because it is equal to n+sod(n) for n = 21133155197 and 21133155206.

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 15 ways as a sum of consecutive naturals, for example, 387166 + ... + 438364.

It is an arithmetic number, because the mean of its divisors is an integer number (1636761600).

Almost surely, 2^21133155235 is an apocalyptic number.

21133155235 is a deficient number, since it is larger than the sum of its proper divisors (5055030365).

21133155235 is a wasteful number, since it uses less digits than its factorization.

21133155235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53898.

The product of its digits is 13500, while the sum is 31.

Adding to 21133155235 its reverse (53255133112), we get a palindrome (74388288347).

The spelling of 21133155235 in words is "twenty-one billion, one hundred thirty-three million, one hundred fifty-five thousand, two hundred thirty-five".