21611245574125 has 128 divisors (see below), whose sum is σ = 28892338675200. Its totient is φ = 16109536665600.

The previous prime is 21611245574123. The next prime is 21611245574143. The reversal of 21611245574125 is 52147554211612.

It is a happy number.

It is not a de Polignac number, because 21611245574125 - 2¹ = 21611245574123 is a prime.

It is a super-3 number, since 3×21611245574125³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21611245574123) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17584414011 + ... + 17584415239.

It is an arithmetic number, because the mean of its divisors is an integer number (225721395900).

Almost surely, 2^{21611245574125} is an apocalyptic number.

21611245574125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21611245574125 is a deficient number, since it is larger than the sum of its proper divisors (7281093101075).

21611245574125 is a wasteful number, since it uses less digits than its factorization.

21611245574125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2576 (or 2566 counting only the distinct ones).

The product of its digits is 672000, while the sum is 46.

Adding to 21611245574125 its reverse (52147554211612), we get a palindrome (73758799785737).

The spelling of 21611245574125 in words is "twenty-one trillion, six hundred eleven billion, two hundred forty-five million, five hundred seventy-four thousand, one hundred twenty-five".