21115335445325 has 72 divisors (see below), whose sum is σ = 29525441063328. Its totient is φ = 14855678640000.

The previous prime is 21115335445213. The next prime is 21115335445327. The reversal of 21115335445325 is 52354453351112.

It is not a de Polignac number, because 21115335445325 - 2¹² = 21115335441229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21115335445327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 785147579 + ... + 785174471.

It is an arithmetic number, because the mean of its divisors is an integer number (410075570324).

Almost surely, 2^{21115335445325} is an apocalyptic number.

21115335445325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21115335445325 is a deficient number, since it is larger than the sum of its proper divisors (8410105618003).

21115335445325 is a wasteful number, since it uses less digits than its factorization.

21115335445325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29947 (or 29911 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 44.

Adding to 21115335445325 its reverse (52354453351112), we get a palindrome (73469788796437).

The spelling of 21115335445325 in words is "twenty-one trillion, one hundred fifteen billion, three hundred thirty-five million, four hundred forty-five thousand, three hundred twenty-five".