123221011 has 2 divisors, whose sum is σ = 123221012. Its totient is φ = 123221010.

The previous prime is 123221009. The next prime is 123221027. The reversal of 123221011 is 110122321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123221011 - 2¹ = 123221009 is a prime.

Together with 123221009, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 123220982 and 123221000.

It is not a weakly prime, because it can be changed into another prime (123221041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610505 + 61610506.

It is an arithmetic number, because the mean of its divisors is an integer number (61610506).

Almost surely, 2^123221011 is an apocalyptic number.

123221011 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221011 is an equidigital number, since it uses as much as digits as its factorization.

123221011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 123221011 is about 11100.4959799101. The cubic root of 123221011 is about 497.6166722145.

Adding to 123221011 its reverse (110122321), we get a palindrome (233343332).

The spelling of 123221011 in words is "one hundred twenty-three million, two hundred twenty-one thousand, eleven".