21110533253 has 8 divisors (see below), whose sum is σ = 21346617600. Its totient is φ = 20875220208.

The previous prime is 21110533237. The next prime is 21110533271. The reversal of 21110533253 is 35233501112.

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

It is a cyclic number.

It is not a de Polignac number, because 21110533253 - 2⁴ = 21110533237 is a prime.

It is a super-2 number, since 2×21110533253² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110533153) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137693 + ... + 247346.

It is an arithmetic number, because the mean of its divisors is an integer number (2668327200).

Almost surely, 2^21110533253 is an apocalyptic number.

It is an amenable number.

21110533253 is a deficient number, since it is larger than the sum of its proper divisors (236084347).

21110533253 is a wasteful number, since it uses less digits than its factorization.

21110533253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385651.

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 21110533253 in words is "twenty-one billion, one hundred ten million, five hundred thirty-three thousand, two hundred fifty-three".