221201221123 has 2 divisors, whose sum is σ = 221201221124. Its totient is φ = 221201221122.

The previous prime is 221201221117. The next prime is 221201221133. The reversal of 221201221123 is 321122102122.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-221201221123 is a prime.

It is a super-2 number, since 2×221201221123² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221201221123.

It is not a weakly prime, because it can be changed into another prime (221201221133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110600610561 + 110600610562.

It is an arithmetic number, because the mean of its divisors is an integer number (110600610562).

Almost surely, 2^221201221123 is an apocalyptic number.

221201221123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221201221123 is an equidigital number, since it uses as much as digits as its factorization.

221201221123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 221201221123 its reverse (321122102122), we get a palindrome (542323323245).

The spelling of 221201221123 in words is "two hundred twenty-one billion, two hundred one million, two hundred twenty-one thousand, one hundred twenty-three".