5481868312921 has 81 divisors (see below), whose sum is σ = 7593180870303. Its totient is φ = 3941316419040.

The previous prime is 5481868312909. The next prime is 5481868312957. The reversal of 5481868312921 is 1292138681845.

The square root of 5481868312921 is 2341339.

It is a perfect power (a square), and thus also a powerful number.

5481868312921 is digitally balanced in base 3, 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 only one way, i.e., 810927265225 + 4670941047696 = 900515^2 + 2161236^2 .

It is not a de Polignac number, because 5481868312921 - 2⁵ = 5481868312889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5481868316921) 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 80 ways as a sum of consecutive naturals, for example, 2343679170 + ... + 2343681508.

Almost surely, 2^{5481868312921} is an apocalyptic number.

5481868312921 is the 2341339-th square number.

5481868312921 is the 1170670-th centered octagonal number.

It is an amenable number.

5481868312921 is a deficient number, since it is larger than the sum of its proper divisors (2111312557382).

5481868312921 is an equidigital number, since it uses as much as digits as its factorization.

5481868312921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4740 (or 2370 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 58.

The spelling of 5481868312921 in words is "five trillion, four hundred eighty-one billion, eight hundred sixty-eight million, three hundred twelve thousand, nine hundred twenty-one".