2635143221 has 2 divisors, whose sum is σ = 2635143222. Its totient is φ = 2635143220.

The previous prime is 2635143169. The next prime is 2635143223. The reversal of 2635143221 is 1223415362.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1979271121 + 655872100 = 44489^2 + 25610^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2635143221 is a prime.

Together with 2635143223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2635143223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1317571610 + 1317571611.

It is an arithmetic number, because the mean of its divisors is an integer number (1317571611).

Almost surely, 2^2635143221 is an apocalyptic number.

It is an amenable number.

2635143221 is a deficient number, since it is larger than the sum of its proper divisors (1).

2635143221 is an equidigital number, since it uses as much as digits as its factorization.

2635143221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 2635143221 is about 51333.6460910386. The cubic root of 2635143221 is about 1381.2365904228.

Adding to 2635143221 its reverse (1223415362), we get a palindrome (3858558583).

The spelling of 2635143221 in words is "two billion, six hundred thirty-five million, one hundred forty-three thousand, two hundred twenty-one".