2121001613 has 2 divisors, whose sum is σ = 2121001614. Its totient is φ = 2121001612.

The previous prime is 2121001591. The next prime is 2121001637. The reversal of 2121001613 is 3161001212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1805655049 + 315346564 = 42493^2 + 17758^2 .

It is a cyclic number.

It is not a de Polignac number, because 2121001613 - 2²⁶ = 2053892749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2121001591 and 2121001600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2121001693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060500806 + 1060500807.

It is an arithmetic number, because the mean of its divisors is an integer number (1060500807).

Almost surely, 2^2121001613 is an apocalyptic number.

It is an amenable number.

2121001613 is a deficient number, since it is larger than the sum of its proper divisors (1).

2121001613 is an equidigital number, since it uses as much as digits as its factorization.

2121001613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 2121001613 is about 46054.3332706055. Note that the first 3 decimals coincide. The cubic root of 2121001613 is about 1284.8339377728.

Adding to 2121001613 its reverse (3161001212), we get a palindrome (5282002825).

The spelling of 2121001613 in words is "two billion, one hundred twenty-one million, one thousand, six hundred thirteen".