2121010123 has 2 divisors, whose sum is σ = 2121010124. Its totient is φ = 2121010122.

The previous prime is 2121010081. The next prime is 2121010189. The reversal of 2121010123 is 3210101212.

2121010123 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121010123 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is not a weakly prime, because it can be changed into another prime (2121010523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060505061 + 1060505062.

It is an arithmetic number, because the mean of its divisors is an integer number (1060505062).

Almost surely, 2^2121010123 is an apocalyptic number.

2121010123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121010123 is an equidigital number, since it uses as much as digits as its factorization.

2121010123 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 2121010123 is about 46054.4256613846. The cubic root of 2121010123 is about 1284.8356561311.

Adding to 2121010123 its reverse (3210101212), we get a palindrome (5331111335).

The spelling of 2121010123 in words is "two billion, one hundred twenty-one million, ten thousand, one hundred twenty-three".