2193641521 has 2 divisors, whose sum is σ = 2193641522. Its totient is φ = 2193641520.

The previous prime is 2193641507. The next prime is 2193641543. The reversal of 2193641521 is 1251463912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2193610896 + 30625 = 46836^2 + 175^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193641521 - 2¹⁹ = 2193117233 is a prime.

It is not a weakly prime, because it can be changed into another prime (2193641501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1096820760 + 1096820761.

It is an arithmetic number, because the mean of its divisors is an integer number (1096820761).

Almost surely, 2^2193641521 is an apocalyptic number.

It is an amenable number.

2193641521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2193641521 is an equidigital number, since it uses as much as digits as its factorization.

2193641521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 2193641521 is about 46836.3269375386. The cubic root of 2193641521 is about 1299.3372402790.

The spelling of 2193641521 in words is "two billion, one hundred ninety-three million, six hundred forty-one thousand, five hundred twenty-one".