123215011 has 2 divisors, whose sum is σ = 123215012. Its totient is φ = 123215010.

The previous prime is 123215009. The next prime is 123215041. The reversal of 123215011 is 110512321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123215011 - 2¹ = 123215009 is a prime.

Together with 123215009, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123215041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61607505 + 61607506.

It is an arithmetic number, because the mean of its divisors is an integer number (61607506).

Almost surely, 2^123215011 is an apocalyptic number.

123215011 is a deficient number, since it is larger than the sum of its proper divisors (1).

123215011 is an equidigital number, since it uses as much as digits as its factorization.

123215011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 123215011 is about 11100.2257184257. The cubic root of 123215011 is about 497.6085952682.

Adding to 123215011 its reverse (110512321), we get a palindrome (233727332).

The spelling of 123215011 in words is "one hundred twenty-three million, two hundred fifteen thousand, eleven".