21133235055 has 32 divisors (see below), whose sum is σ = 34992258048. Its totient is φ = 10882684800.

The previous prime is 21133234949. The next prime is 21133235063. The reversal of 21133235055 is 55053233112.

It is not a de Polignac number, because 21133235055 - 2⁸ = 21133234799 is a prime.

It is a super-2 number, since 2×21133235055² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 72631 + ... + 218040.

It is an arithmetic number, because the mean of its divisors is an integer number (1093508064).

Almost surely, 2^21133235055 is an apocalyptic number.

21133235055 is a deficient number, since it is larger than the sum of its proper divisors (13859022993).

21133235055 is a wasteful number, since it uses less digits than its factorization.

21133235055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290847.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 21133235055 its reverse (55053233112), we get a palindrome (76186468167).

The spelling of 21133235055 in words is "twenty-one billion, one hundred thirty-three million, two hundred thirty-five thousand, fifty-five".