2321536748281 has 9 divisors (see below), whose sum is σ = 2466158248399. Its totient is φ = 2184951384544.

The previous prime is 2321536748269. The next prime is 2321536748291. The reversal of 2321536748281 is 1828476351232.

The square root of 2321536748281 is 1523659.

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

It can be written as a sum of positive squares in only one way, i.e., 1807424804025 + 514111944256 = 1344405^2 + 717016^2 .

It is not a de Polignac number, because 2321536748281 - 2⁵ = 2321536748249 is a prime.

It is a super-2 number, since 2×2321536748281² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2321536748291) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 25857390 + ... + 25947016.

Almost surely, 2^{2321536748281} is an apocalyptic number.

2321536748281 is the 1523659-th square number.

2321536748281 is the 761830-th centered octagonal number.

It is an amenable number.

2321536748281 is a deficient number, since it is larger than the sum of its proper divisors (144621500118).

2321536748281 is an frugal number, since it uses more digits than its factorization.

2321536748281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179288 (or 89644 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 52.

The spelling of 2321536748281 in words is "two trillion, three hundred twenty-one billion, five hundred thirty-six million, seven hundred forty-eight thousand, two hundred eighty-one".