221043145551101 has 2 divisors, whose sum is σ = 221043145551102. Its totient is φ = 221043145551100.

The previous prime is 221043145551091. The next prime is 221043145551127. The reversal of 221043145551101 is 101155541340122.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176015677068100 + 45027468483001 = 13267090^2 + 6710251^2 .

It is a cyclic number.

It is not a de Polignac number, because 221043145551101 - 2³⁰ = 221042071809277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221043145551161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521572775550 + 110521572775551.

It is an arithmetic number, because the mean of its divisors is an integer number (110521572775551).

Almost surely, 2^{221043145551101} is an apocalyptic number.

It is an amenable number.

221043145551101 is a deficient number, since it is larger than the sum of its proper divisors (1).

221043145551101 is an equidigital number, since it uses as much as digits as its factorization.

221043145551101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24000, while the sum is 35.

Adding to 221043145551101 its reverse (101155541340122), we get a palindrome (322198686891223).

The spelling of 221043145551101 in words is "two hundred twenty-one trillion, forty-three billion, one hundred forty-five million, five hundred fifty-one thousand, one hundred one".