221544067128551 has 2 divisors, whose sum is σ = 221544067128552. Its totient is φ = 221544067128550.

The previous prime is 221544067128451. The next prime is 221544067128641. The reversal of 221544067128551 is 155821760445122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221544067128551 - 2¹⁰ = 221544067127527 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 221544067128493 and 221544067128502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221544067128451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110772033564275 + 110772033564276.

It is an arithmetic number, because the mean of its divisors is an integer number (110772033564276).

Almost surely, 2^{221544067128551} is an apocalyptic number.

221544067128551 is a deficient number, since it is larger than the sum of its proper divisors (1).

221544067128551 is an equidigital number, since it uses as much as digits as its factorization.

221544067128551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376000, while the sum is 53.

The spelling of 221544067128551 in words is "two hundred twenty-one trillion, five hundred forty-four billion, sixty-seven million, one hundred twenty-eight thousand, five hundred fifty-one".