2021121313 has 4 divisors (see below), whose sum is σ = 2140010820. Its totient is φ = 1902231808.

The previous prime is 2021121293. The next prime is 2021121329. The reversal of 2021121313 is 3131211202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1412857744 + 608263569 = 37588^2 + 24663^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021121313 - 2¹⁷ = 2020990241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021121373) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59444728 + ... + 59444761.

It is an arithmetic number, because the mean of its divisors is an integer number (535002705).

Almost surely, 2^2021121313 is an apocalyptic number.

It is an amenable number.

2021121313 is a deficient number, since it is larger than the sum of its proper divisors (118889507).

2021121313 is a wasteful number, since it uses less digits than its factorization.

2021121313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118889506.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 2021121313 is about 44956.8828212099. The cubic root of 2021121313 is about 1264.3407257976.

Adding to 2021121313 its reverse (3131211202), we get a palindrome (5152332515).

The spelling of 2021121313 in words is "two billion, twenty-one million, one hundred twenty-one thousand, three hundred thirteen".