21115053253 has 16 divisors (see below), whose sum is σ = 24277501440. Its totient is φ = 17989272576.

The previous prime is 21115053227. The next prime is 21115053277. The reversal of 21115053253 is 35235051112.

It is a cyclic number.

It is not a de Polignac number, because 21115053253 - 2⁹ = 21115052741 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 (21115053203) 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, 1719108 + ... + 1731346.

It is an arithmetic number, because the mean of its divisors is an integer number (1517343840).

Almost surely, 2^21115053253 is an apocalyptic number.

It is an amenable number.

21115053253 is a deficient number, since it is larger than the sum of its proper divisors (3162448187).

21115053253 is a wasteful number, since it uses less digits than its factorization.

21115053253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13716.

The product of its (nonzero) digits is 4500, while the sum is 28.

The spelling of 21115053253 in words is "twenty-one billion, one hundred fifteen million, fifty-three thousand, two hundred fifty-three".