3111212021 has 4 divisors (see below), whose sum is σ = 3112675500. Its totient is φ = 3109748544.

The previous prime is 3111211997. The next prime is 3111212029. The reversal of 3111212021 is 1202121113.

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 531994225 + 2579217796 = 23065^2 + 50786^2 .

It is a cyclic number.

It is not a de Polignac number, because 3111212021 - 2²⁶ = 3044103157 is a prime.

It is a super-3 number, since 3×3111212021³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3111211987 and 3111212005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111212029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 728546 + ... + 732803.

It is an arithmetic number, because the mean of its divisors is an integer number (778168875).

Almost surely, 2^3111212021 is an apocalyptic number.

It is an amenable number.

3111212021 is a deficient number, since it is larger than the sum of its proper divisors (1463479).

3111212021 is a wasteful number, since it uses less digits than its factorization.

3111212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1463478.

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

The square root of 3111212021 is about 55778.2396728330. The cubic root of 3111212021 is about 1459.8554965821.

Adding to 3111212021 its reverse (1202121113), we get a palindrome (4313333134).

The spelling of 3111212021 in words is "three billion, one hundred eleven million, two hundred twelve thousand, twenty-one".