21253242044115 has 64 divisors (see below), whose sum is σ = 37837392721920. Its totient is φ = 11318911591680.

The previous prime is 21253242044087. The next prime is 21253242044117. The reversal of 21253242044115 is 51144024235212.

21253242044115 is a `hidden beast` number, since 2 + 1 + 2 + 5 + 32 + 4 + 204 + 411 + 5 = 666.

It is not a de Polignac number, because 21253242044115 - 2²⁵ = 21253208489683 is a prime.

It is a super-2 number, since 2×21253242044115² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21253242044115.

It is not an unprimeable number, because it can be changed into a prime (21253242044117) 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, 981799222 + ... + 981820868.

It is an arithmetic number, because the mean of its divisors is an integer number (591209261280).

Almost surely, 2^{21253242044115} is an apocalyptic number.

21253242044115 is a deficient number, since it is larger than the sum of its proper divisors (16584150677805).

21253242044115 is a wasteful number, since it uses less digits than its factorization.

21253242044115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31689 (or 31683 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 21253242044115 its reverse (51144024235212), we get a palindrome (72397266279327).

The spelling of 21253242044115 in words is "twenty-one trillion, two hundred fifty-three billion, two hundred forty-two million, forty-four thousand, one hundred fifteen".