3111221120021 has 16 divisors (see below), whose sum is σ = 3631409134080. Its totient is φ = 2609967415680.

The previous prime is 3111221120011. The next prime is 3111221120023. The reversal of 3111221120021 is 1200211221113.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3111221120021 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3111221120023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28885415 + ... + 28992923.

It is an arithmetic number, because the mean of its divisors is an integer number (226963070880).

Almost surely, 2^{3111221120021} is an apocalyptic number.

It is an amenable number.

3111221120021 is a deficient number, since it is larger than the sum of its proper divisors (520188014059).

3111221120021 is a wasteful number, since it uses less digits than its factorization.

3111221120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195524.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 3111221120021 its reverse (1200211221113), we get a palindrome (4311432341134).

The spelling of 3111221120021 in words is "three trillion, one hundred eleven billion, two hundred twenty-one million, one hundred twenty thousand, twenty-one".