2101223123 has 2 divisors, whose sum is σ = 2101223124. Its totient is φ = 2101223122.

The previous prime is 2101223099. The next prime is 2101223143. The reversal of 2101223123 is 3213221012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2101223123 - 2⁸ = 2101222867 is a prime.

It is a super-2 number, since 2×2101223123² = 8830277225259746258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2101223143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050611561 + 1050611562.

It is an arithmetic number, because the mean of its divisors is an integer number (1050611562).

Almost surely, 2^2101223123 is an apocalyptic number.

2101223123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101223123 is an equidigital number, since it uses as much as digits as its factorization.

2101223123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2101223123 is about 45839.1003729349. The cubic root of 2101223123 is about 1280.8277367074.

Adding to 2101223123 its reverse (3213221012), we get a palindrome (5314444135).

The spelling of 2101223123 in words is "two billion, one hundred one million, two hundred twenty-three thousand, one hundred twenty-three".