21115525356260 has 24 divisors (see below), whose sum is σ = 44681096408256. Its totient is φ = 8381735254880.

The previous prime is 21115525356253. The next prime is 21115525356281. The reversal of 21115525356260 is 6265352551112.

It is a super-2 number, since 2×21115525356260² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4029677792 + ... + 4029683031.

It is an arithmetic number, because the mean of its divisors is an integer number (1861712350344).

Almost surely, 2^{21115525356260} is an apocalyptic number.

21115525356260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115525356260 is an abundant number, since it is smaller than the sum of its proper divisors (23565571051996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21115525356260 is a wasteful number, since it uses less digits than its factorization.

21115525356260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8059360963 (or 8059360961 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 44.

The spelling of 21115525356260 in words is "twenty-one trillion, one hundred fifteen billion, five hundred twenty-five million, three hundred fifty-six thousand, two hundred sixty".