2101210123 has 2 divisors, whose sum is σ = 2101210124. Its totient is φ = 2101210122.

The previous prime is 2101210121. The next prime is 2101210147. The reversal of 2101210123 is 3210121012.

2101210123 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 not a de Polignac number, because 2101210123 - 2¹ = 2101210121 is a prime.

Together with 2101210121, it forms a pair of twin primes.

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 (2101210121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050605061 + 1050605062.

It is an arithmetic number, because the mean of its divisors is an integer number (1050605062).

Almost surely, 2^2101210123 is an apocalyptic number.

2101210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101210123 is an equidigital number, since it uses as much as digits as its factorization.

2101210123 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2101210123 is about 45838.9585723760. The cubic root of 2101210123 is about 1280.8250952626.

Adding to 2101210123 its reverse (3210121012), we get a palindrome (5311331135).

It can be divided in two parts, 210121012 and 3, that multiplied together give a palindrome (630363036).

The spelling of 2101210123 in words is "two billion, one hundred one million, two hundred ten thousand, one hundred twenty-three".