3240399612321 has 27 divisors (see below), whose sum is σ = 4706468390169. Its totient is φ = 2148382075392.

The previous prime is 3240399612319. The next prime is 3240399612383. The reversal of 3240399612321 is 1232169930423.

The square root of 3240399612321 is 1800111.

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

3240399612321 is a `hidden beast` number, since 3 + 2 + 4 + 0 + 3 + 9 + 9 + 612 + 3 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1098754686225 + 2141644926096 = 1048215^2 + 1463436^2 .

It is not a de Polignac number, because 3240399612321 - 2¹ = 3240399612319 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3240399612391) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 1042262715 + ... + 1042265823.

Almost surely, 2^{3240399612321} is an apocalyptic number.

3240399612321 is the 1800111-st square number.

3240399612321 is the 900056-th centered octagonal number.

It is an amenable number.

3240399612321 is a deficient number, since it is larger than the sum of its proper divisors (1466068777848).

3240399612321 is an frugal number, since it uses more digits than its factorization.

3240399612321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6610 (or 3305 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 45.

The spelling of 3240399612321 in words is "three trillion, two hundred forty billion, three hundred ninety-nine million, six hundred twelve thousand, three hundred twenty-one".