221043023077 has 2 divisors, whose sum is σ = 221043023078. Its totient is φ = 221043023076.

The previous prime is 221043023063. The next prime is 221043023111. The reversal of 221043023077 is 770320340122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118469509636 + 102573513441 = 344194^2 + 320271^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221043023077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221043023027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110521511538 + 110521511539.

It is an arithmetic number, because the mean of its divisors is an integer number (110521511539).

Almost surely, 2^221043023077 is an apocalyptic number.

It is an amenable number.

221043023077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221043023077 is an equidigital number, since it uses as much as digits as its factorization.

221043023077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 31.

Adding to 221043023077 its reverse (770320340122), we get a palindrome (991363363199).

The spelling of 221043023077 in words is "two hundred twenty-one billion, forty-three million, twenty-three thousand, seventy-seven".