221123523077 has 2 divisors, whose sum is σ = 221123523078. Its totient is φ = 221123523076.

The previous prime is 221123523041. The next prime is 221123523119. The reversal of 221123523077 is 770325321122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 153827899681 + 67295623396 = 392209^2 + 259414^2 .

It is a cyclic number.

It is not a de Polignac number, because 221123523077 - 2⁶ = 221123523013 is a prime.

It is a super-2 number, since 2×221123523077² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221123523017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110561761538 + 110561761539.

It is an arithmetic number, because the mean of its divisors is an integer number (110561761539).

Almost surely, 2^221123523077 is an apocalyptic number.

It is an amenable number.

221123523077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221123523077 is an equidigital number, since it uses as much as digits as its factorization.

221123523077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 35.

Adding to 221123523077 its reverse (770325321122), we get a palindrome (991448844199).

The spelling of 221123523077 in words is "two hundred twenty-one billion, one hundred twenty-three million, five hundred twenty-three thousand, seventy-seven".