2121001213 has 2 divisors, whose sum is σ = 2121001214. Its totient is φ = 2121001212.

The previous prime is 2121001193. The next prime is 2121001241. The reversal of 2121001213 is 3121001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2046386169 + 74615044 = 45237^2 + 8638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2121001213 is a prime.

It is a super-2 number, since 2×2121001213² = 8997292291094942738, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2121001193 and 2121001202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121001613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060500606 + 1060500607.

It is an arithmetic number, because the mean of its divisors is an integer number (1060500607).

Almost surely, 2^2121001213 is an apocalyptic number.

It is an amenable number.

2121001213 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121001213 is an equidigital number, since it uses as much as digits as its factorization.

2121001213 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 2121001213 is about 46054.3289279086. The cubic root of 2121001213 is about 1284.8338570038.

Adding to 2121001213 its reverse (3121001212), we get a palindrome (5242002425).

Subtracting 2121001213 from its reverse (3121001212), we obtain a palindrome (999999999).

The spelling of 2121001213 in words is "two billion, one hundred twenty-one million, one thousand, two hundred thirteen".