21052353504431 has 2 divisors, whose sum is σ = 21052353504432. Its totient is φ = 21052353504430.

The previous prime is 21052353504421. The next prime is 21052353504493. The reversal of 21052353504431 is 13440535325012.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21052353504431 is a prime.

It is a super-2 number, since 2×21052353504431² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21052353504421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526176752215 + 10526176752216.

It is an arithmetic number, because the mean of its divisors is an integer number (10526176752216).

Almost surely, 2^{21052353504431} is an apocalyptic number.

21052353504431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21052353504431 is an equidigital number, since it uses as much as digits as its factorization.

21052353504431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216000, while the sum is 38.

Adding to 21052353504431 its reverse (13440535325012), we get a palindrome (34492888829443).

The spelling of 21052353504431 in words is "twenty-one trillion, fifty-two billion, three hundred fifty-three million, five hundred four thousand, four hundred thirty-one".