2143692521 has 2 divisors, whose sum is σ = 2143692522. Its totient is φ = 2143692520.

The previous prime is 2143692517. The next prime is 2143692527. The reversal of 2143692521 is 1252963412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1486488025 + 657204496 = 38555^2 + 25636^2 .

It is a cyclic number.

It is not a de Polignac number, because 2143692521 - 2² = 2143692517 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2143692527) 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 as a sum of consecutive naturals, namely, 1071846260 + 1071846261.

It is an arithmetic number, because the mean of its divisors is an integer number (1071846261).

Almost surely, 2^2143692521 is an apocalyptic number.

It is an amenable number.

2143692521 is a deficient number, since it is larger than the sum of its proper divisors (1).

2143692521 is an equidigital number, since it uses as much as digits as its factorization.

2143692521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 35.

The square root of 2143692521 is about 46300.0272246140. The cubic root of 2143692521 is about 1289.3995003696.

The spelling of 2143692521 in words is "two billion, one hundred forty-three million, six hundred ninety-two thousand, five hundred twenty-one".