1635053143421 has 2 divisors, whose sum is σ = 1635053143422. Its totient is φ = 1635053143420.

The previous prime is 1635053143379. The next prime is 1635053143439. The reversal of 1635053143421 is 1243413505361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 844954377796 + 790098765625 = 919214^2 + 888875^2 .

It is an emirp because it is prime and its reverse (1243413505361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1635053143421 - 2¹⁸ = 1635052881277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1635053143021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817526571710 + 817526571711.

It is an arithmetic number, because the mean of its divisors is an integer number (817526571711).

Almost surely, 2^{1635053143421} is an apocalyptic number.

It is an amenable number.

1635053143421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1635053143421 is an equidigital number, since it uses as much as digits as its factorization.

1635053143421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129600, while the sum is 38.

Adding to 1635053143421 its reverse (1243413505361), we get a palindrome (2878466648782).

The spelling of 1635053143421 in words is "one trillion, six hundred thirty-five billion, fifty-three million, one hundred forty-three thousand, four hundred twenty-one".