221232213077 has 2 divisors, whose sum is σ = 221232213078. Its totient is φ = 221232213076.

The previous prime is 221232213011. The next prime is 221232213089. The reversal of 221232213077 is 770312232122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 174662141476 + 46570071601 = 417926^2 + 215801^2 .

It is a cyclic number.

It is not a de Polignac number, because 221232213077 - 2⁸ = 221232212821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221232273077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110616106538 + 110616106539.

It is an arithmetic number, because the mean of its divisors is an integer number (110616106539).

Almost surely, 2^221232213077 is an apocalyptic number.

It is an amenable number.

221232213077 is a deficient number, since it is larger than the sum of its proper divisors (1).

221232213077 is an equidigital number, since it uses as much as digits as its factorization.

221232213077 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 32.

Adding to 221232213077 its reverse (770312232122), we get a palindrome (991544445199).

The spelling of 221232213077 in words is "two hundred twenty-one billion, two hundred thirty-two million, two hundred thirteen thousand, seventy-seven".