221213042123 has 2 divisors, whose sum is σ = 221213042124. Its totient is φ = 221213042122.

The previous prime is 221213042101. The next prime is 221213042143. The reversal of 221213042123 is 321240312122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221213042123 - 2¹⁰ = 221213041099 is a prime.

It is not a weakly prime, because it can be changed into another prime (221213042143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110606521061 + 110606521062.

It is an arithmetic number, because the mean of its divisors is an integer number (110606521062).

Almost surely, 2^221213042123 is an apocalyptic number.

221213042123 is a deficient number, since it is larger than the sum of its proper divisors (1).

221213042123 is an equidigital number, since it uses as much as digits as its factorization.

221213042123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 221213042123 its reverse (321240312122), we get a palindrome (542453354245).

The spelling of 221213042123 in words is "two hundred twenty-one billion, two hundred thirteen million, forty-two thousand, one hundred twenty-three".