21531353003255 has 16 divisors (see below), whose sum is σ = 25873083016704. Its totient is φ = 17201444027040.

The previous prime is 21531353003249. The next prime is 21531353003257. The reversal of 21531353003255 is 55230035313512.

It is not a de Polignac number, because 21531353003255 - 2⁶ = 21531353003191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531353003257) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 250522640 + ... + 250608570.

It is an arithmetic number, because the mean of its divisors is an integer number (1617067688544).

Almost surely, 2^{21531353003255} is an apocalyptic number.

21531353003255 is a deficient number, since it is larger than the sum of its proper divisors (4341730013449).

21531353003255 is an equidigital number, since it uses as much as digits as its factorization.

21531353003255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154126.

The product of its (nonzero) digits is 202500, while the sum is 38.

Adding to 21531353003255 its reverse (55230035313512), we get a palindrome (76761388316767).

The spelling of 21531353003255 in words is "twenty-one trillion, five hundred thirty-one billion, three hundred fifty-three million, three thousand, two hundred fifty-five".