2021121311 has 8 divisors (see below), whose sum is σ = 2226267264. Its totient is φ = 1819543320.

The previous prime is 2021121293. The next prime is 2021121329. The reversal of 2021121311 is 1131211202.

It is an interprime number because it is at equal distance from previous prime (2021121293) and next prime (2021121329).

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 2021121311 - 2¹⁴ = 2021104927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021121611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 890801 + ... + 893066.

It is an arithmetic number, because the mean of its divisors is an integer number (278283408).

Almost surely, 2^2021121311 is an apocalyptic number.

2021121311 is a deficient number, since it is larger than the sum of its proper divisors (205145953).

2021121311 is a wasteful number, since it uses less digits than its factorization.

2021121311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783981.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 2021121311 is about 44956.8827989664. The cubic root of 2021121311 is about 1264.3407253806.

Adding to 2021121311 its reverse (1131211202), we get a palindrome (3152332513).

The spelling of 2021121311 in words is "two billion, twenty-one million, one hundred twenty-one thousand, three hundred eleven".