21101055253 has 8 divisors (see below), whose sum is σ = 21200637920. Its totient is φ = 21001673520.

The previous prime is 21101055251. The next prime is 21101055257. The reversal of 21101055253 is 35255010112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21101055253 - 2¹ = 21101055251 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 (21101055251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162403 + ... + 261871.

It is an arithmetic number, because the mean of its divisors is an integer number (2650079740).

Almost surely, 2^21101055253 is an apocalyptic number.

It is an amenable number.

21101055253 is a deficient number, since it is larger than the sum of its proper divisors (99582667).

21101055253 is an equidigital number, since it uses as much as digits as its factorization.

21101055253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100467.

The product of its (nonzero) digits is 1500, while the sum is 25.

Adding to 21101055253 its reverse (35255010112), we get a palindrome (56356065365).

The spelling of 21101055253 in words is "twenty-one billion, one hundred one million, fifty-five thousand, two hundred fifty-three".