1220123011 has 2 divisors, whose sum is σ = 1220123012. Its totient is φ = 1220123010.

The previous prime is 1220122973. The next prime is 1220123039. The reversal of 1220123011 is 1103210221.

It is a strong prime.

It is an emirp because it is prime and its reverse (1103210221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1220123011 - 2¹⁵ = 1220090243 is a prime.

It is a super-2 number, since 2×1220123011² = 2977400323943412242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1220122982 and 1220123000.

It is not a weakly prime, because it can be changed into another prime (1220123081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610061505 + 610061506.

It is an arithmetic number, because the mean of its divisors is an integer number (610061506).

Almost surely, 2^1220123011 is an apocalyptic number.

1220123011 is a deficient number, since it is larger than the sum of its proper divisors (1).

1220123011 is an equidigital number, since it uses as much as digits as its factorization.

1220123011 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 1220123011 is about 34930.2592461035. The cubic root of 1220123011 is about 1068.5656417590.

Adding to 1220123011 its reverse (1103210221), we get a palindrome (2323333232).

The spelling of 1220123011 in words is "one billion, two hundred twenty million, one hundred twenty-three thousand, eleven".