221210021222137 has 2 divisors, whose sum is σ = 221210021222138. Its totient is φ = 221210021222136.

The previous prime is 221210021222093. The next prime is 221210021222153. The reversal of 221210021222137 is 731222120012122.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116140366600336 + 105069654621801 = 10776844^2 + 10250349^2 .

It is a cyclic number.

It is not a de Polignac number, because 221210021222137 - 2¹⁵ = 221210021189369 is a prime.

It is not a weakly prime, because it can be changed into another prime (221210021222167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110605010611068 + 110605010611069.

It is an arithmetic number, because the mean of its divisors is an integer number (110605010611069).

Almost surely, 2^{221210021222137} is an apocalyptic number.

It is an amenable number.

221210021222137 is a deficient number, since it is larger than the sum of its proper divisors (1).

221210021222137 is an equidigital number, since it uses as much as digits as its factorization.

221210021222137 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 28.

Adding to 221210021222137 its reverse (731222120012122), we get a palindrome (952432141234259).

The spelling of 221210021222137 in words is "two hundred twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twenty-two thousand, one hundred thirty-seven".