21255331043133 has 64 divisors (see below), whose sum is σ = 34441158493440. Its totient is φ = 12848644915200.

The previous prime is 21255331042999. The next prime is 21255331043147. The reversal of 21255331043133 is 33134013355212.

21255331043133 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 5 + 331 + 0 + 4 + 313 + 3 = 666.

It is not a de Polignac number, because 21255331043133 - 2²⁸ = 21255062607677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21255331043183) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 185941191 + ... + 186055467.

It is an arithmetic number, because the mean of its divisors is an integer number (538143101460).

Almost surely, 2^{21255331043133} is an apocalyptic number.

It is an amenable number.

21255331043133 is a deficient number, since it is larger than the sum of its proper divisors (13185827450307).

21255331043133 is a wasteful number, since it uses less digits than its factorization.

21255331043133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115915 (or 115909 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 36.

Adding to 21255331043133 its reverse (33134013355212), we get a palindrome (54389344398345).

The spelling of 21255331043133 in words is "twenty-one trillion, two hundred fifty-five billion, three hundred thirty-one million, forty-three thousand, one hundred thirty-three".