221365234507 has 2 divisors, whose sum is σ = 221365234508. Its totient is φ = 221365234506.

The previous prime is 221365234483. The next prime is 221365234513. The reversal of 221365234507 is 705432563122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221365234507 - 2⁷ = 221365234379 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221365234507.

It is not a weakly prime, because it can be changed into another prime (221365234537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110682617253 + 110682617254.

It is an arithmetic number, because the mean of its divisors is an integer number (110682617254).

Almost surely, 2^221365234507 is an apocalyptic number.

221365234507 is a deficient number, since it is larger than the sum of its proper divisors (1).

221365234507 is an equidigital number, since it uses as much as digits as its factorization.

221365234507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 302400, while the sum is 40.

Adding to 221365234507 its reverse (705432563122), we get a palindrome (926797797629).

The spelling of 221365234507 in words is "two hundred twenty-one billion, three hundred sixty-five million, two hundred thirty-four thousand, five hundred seven".