221541543031 has 2 divisors, whose sum is σ = 221541543032. Its totient is φ = 221541543030.

The previous prime is 221541543017. The next prime is 221541543043. The reversal of 221541543031 is 130345145122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221541543031 - 2³³ = 212951608439 is a prime.

It is a super-2 number, since 2×221541543031² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221541542984 and 221541543002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221541543071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110770771515 + 110770771516.

It is an arithmetic number, because the mean of its divisors is an integer number (110770771516).

Almost surely, 2^221541543031 is an apocalyptic number.

221541543031 is a deficient number, since it is larger than the sum of its proper divisors (1).

221541543031 is an equidigital number, since it uses as much as digits as its factorization.

221541543031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14400, while the sum is 31.

Adding to 221541543031 its reverse (130345145122), we get a palindrome (351886688153).

The spelling of 221541543031 in words is "two hundred twenty-one billion, five hundred forty-one million, five hundred forty-three thousand, thirty-one".