2123012021 has 32 divisors (see below), whose sum is σ = 2393042400. Its totient is φ = 1870848000.

The previous prime is 2123012009. The next prime is 2123012053. The reversal of 2123012021 is 1202103212.

It is a happy number.

It can be written as a sum of positive squares in 16 ways, for example, as 1053002500 + 1070009521 = 32450^2 + 32711^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123012021 - 2¹⁰ = 2123010997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123011987 and 2123012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123012321) 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 in 31 ways as a sum of consecutive naturals, for example, 6082955 + ... + 6083303.

It is an arithmetic number, because the mean of its divisors is an integer number (74782575).

Almost surely, 2^2123012021 is an apocalyptic number.

It is an amenable number.

2123012021 is a deficient number, since it is larger than the sum of its proper divisors (270030379).

2123012021 is a wasteful number, since it uses less digits than its factorization.

2123012021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 2123012021 is about 46076.1545813016. The cubic root of 2123012021 is about 1285.2397562192.

Adding to 2123012021 its reverse (1202103212), we get a palindrome (3325115233).

The spelling of 2123012021 in words is "two billion, one hundred twenty-three million, twelve thousand, twenty-one".