1210123442021 has 4 divisors (see below), whose sum is σ = 1303209860652. Its totient is φ = 1117037023392.

The previous prime is 1210123442009. The next prime is 1210123442029. The reversal of 1210123442021 is 1202443210121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194383992100 + 1015739449921 = 440890^2 + 1007839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210123442021 - 2³⁴ = 1192943572837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210123442029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46543209296 + ... + 46543209321.

It is an arithmetic number, because the mean of its divisors is an integer number (325802465163).

Almost surely, 2^{1210123442021} is an apocalyptic number.

It is an amenable number.

1210123442021 is a deficient number, since it is larger than the sum of its proper divisors (93086418631).

1210123442021 is an equidigital number, since it uses as much as digits as its factorization.

1210123442021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93086418630.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 1210123442021 its reverse (1202443210121), we get a palindrome (2412566652142).

The spelling of 1210123442021 in words is "one trillion, two hundred ten billion, one hundred twenty-three million, four hundred forty-two thousand, twenty-one".