2102656321 has 4 divisors (see below), whose sum is σ = 2107797700. Its totient is φ = 2097514944.

The previous prime is 2102656319. The next prime is 2102656349. The reversal of 2102656321 is 1236562012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1699088400 + 403567921 = 41220^2 + 20089^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102656321 - 2¹ = 2102656319 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2102656321.

It is not an unprimeable number, because it can be changed into a prime (2102656351) 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 3 ways as a sum of consecutive naturals, for example, 2570076 + ... + 2570893.

It is an arithmetic number, because the mean of its divisors is an integer number (526949425).

Almost surely, 2^2102656321 is an apocalyptic number.

It is an amenable number.

2102656321 is a deficient number, since it is larger than the sum of its proper divisors (5141379).

2102656321 is an equidigital number, since it uses as much as digits as its factorization.

2102656321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5141378.

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 2102656321 is about 45854.7306283659. The cubic root of 2102656321 is about 1281.1188786507.

The spelling of 2102656321 in words is "two billion, one hundred two million, six hundred fifty-six thousand, three hundred twenty-one".