2123805297321 has 48 divisors (see below), whose sum is σ = 3127876099920. Its totient is φ = 1388386137600.

The previous prime is 2123805297301. The next prime is 2123805297337. The reversal of 2123805297321 is 1237925083212.

2123805297321 is a `hidden beast` number, since 2 + 1 + 2 + 38 + 0 + 5 + 297 + 321 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 578907939600 + 1544897357721 = 760860^2 + 1242939^2 .

It is not a de Polignac number, because 2123805297321 - 2³⁵ = 2089445558953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2123805297301) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 405535915 + ... + 405541151.

It is an arithmetic number, because the mean of its divisors is an integer number (65164085415).

Almost surely, 2^{2123805297321} is an apocalyptic number.

It is an amenable number.

2123805297321 is a deficient number, since it is larger than the sum of its proper divisors (1004070802599).

2123805297321 is a wasteful number, since it uses less digits than its factorization.

2123805297321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9546 (or 9543 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The spelling of 2123805297321 in words is "two trillion, one hundred twenty-three billion, eight hundred five million, two hundred ninety-seven thousand, three hundred twenty-one".