2120121305 has 8 divisors (see below), whose sum is σ = 2545748232. Its totient is φ = 1695028608.

The previous prime is 2120121293. The next prime is 2120121313. The reversal of 2120121305 is 5031210212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 283484569 + 1836636736 = 16837^2 + 42856^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2120121305 - 2²⁶ = 2053012441 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124772 + ... + 140741.

It is an arithmetic number, because the mean of its divisors is an integer number (318218529).

Almost surely, 2^2120121305 is an apocalyptic number.

It is an amenable number.

2120121305 is a deficient number, since it is larger than the sum of its proper divisors (425626927).

2120121305 is a wasteful number, since it uses less digits than its factorization.

2120121305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267115.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 2120121305 is about 46044.7750021650. The cubic root of 2120121305 is about 1284.6561591702.

Adding to 2120121305 its reverse (5031210212), we get a palindrome (7151331517).

The spelling of 2120121305 in words is "two billion, one hundred twenty million, one hundred twenty-one thousand, three hundred five".