2121023213 has 2 divisors, whose sum is σ = 2121023214. Its totient is φ = 2121023212.

The previous prime is 2121023171. The next prime is 2121023237. The reversal of 2121023213 is 3123201212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2115724009 + 5299204 = 45997^2 + 2302^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121023213 - 2¹⁴ = 2121006829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121023191 and 2121023200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121029213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060511606 + 1060511607.

It is an arithmetic number, because the mean of its divisors is an integer number (1060511607).

Almost surely, 2^2121023213 is an apocalyptic number.

It is an amenable number.

2121023213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121023213 is an equidigital number, since it uses as much as digits as its factorization.

2121023213 is an odious number, because the sum of its binary digits is odd.

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

The square root of 2121023213 is about 46054.5677756289. The cubic root of 2121023213 is about 1284.8382992843.

Adding to 2121023213 its reverse (3123201212), we get a palindrome (5244224425).

The spelling of 2121023213 in words is "two billion, one hundred twenty-one million, twenty-three thousand, two hundred thirteen".