123220213121111 has 2 divisors, whose sum is σ = 123220213121112. Its totient is φ = 123220213121110.

The previous prime is 123220213121107. The next prime is 123220213121167. The reversal of 123220213121111 is 111121312022321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123220213121111 - 2² = 123220213121107 is a prime.

It is a super-2 number, since 2×123220213121111² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123220213121171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610106560555 + 61610106560556.

It is an arithmetic number, because the mean of its divisors is an integer number (61610106560556).

Almost surely, 2^{123220213121111} is an apocalyptic number.

123220213121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

123220213121111 is an equidigital number, since it uses as much as digits as its factorization.

123220213121111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 23.

Adding to 123220213121111 its reverse (111121312022321), we get a palindrome (234341525143432).

The spelling of 123220213121111 in words is "one hundred twenty-three trillion, two hundred twenty billion, two hundred thirteen million, one hundred twenty-one thousand, one hundred eleven".