21115514135360 has 28 divisors (see below), whose sum is σ = 50281318035588. Its totient is φ = 8446205654016.

The previous prime is 21115514135323. The next prime is 21115514135461. The reversal of 21115514135360 is 6353141551112.

21115514135360 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 5618568603904 + 15496945531456 = 2370352^2 + 3936616^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32992990517 + ... + 32992991156.

Almost surely, 2^{21115514135360} is an apocalyptic number.

21115514135360 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21115514135360 is an abundant number, since it is smaller than the sum of its proper divisors (29165803900228).

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

21115514135360 is an equidigital number, since it uses as much as digits as its factorization.

21115514135360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65985981690 (or 65985981680 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 38.

Adding to 21115514135360 its reverse (6353141551112), we get a palindrome (27468655686472).

The spelling of 21115514135360 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fourteen million, one hundred thirty-five thousand, three hundred sixty".