221552431142543 has 2 divisors, whose sum is σ = 221552431142544. Its totient is φ = 221552431142542.

The previous prime is 221552431142513. The next prime is 221552431142557. The reversal of 221552431142543 is 345241134255122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221552431142543 - 2¹² = 221552431138447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221552431142494 and 221552431142503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221552431142513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110776215571271 + 110776215571272.

It is an arithmetic number, because the mean of its divisors is an integer number (110776215571272).

Almost surely, 2^{221552431142543} is an apocalyptic number.

221552431142543 is a deficient number, since it is larger than the sum of its proper divisors (1).

221552431142543 is an equidigital number, since it uses as much as digits as its factorization.

221552431142543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152000, while the sum is 44.

Adding to 221552431142543 its reverse (345241134255122), we get a palindrome (566793565397665).

The spelling of 221552431142543 in words is "two hundred twenty-one trillion, five hundred fifty-two billion, four hundred thirty-one million, one hundred forty-two thousand, five hundred forty-three".