2331311021221 has 8 divisors (see below), whose sum is σ = 2869305872384. Its totient is φ = 1844553774960.

The previous prime is 2331311021209. The next prime is 2331311021231. The reversal of 2331311021221 is 1221201131332.

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

It is not a de Polignac number, because 2331311021221 - 2¹¹ = 2331311019173 is a prime.

It is a super-2 number, since 2×2331311021221² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2331311021192 and 2331311021201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2331311021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12809401125 + ... + 12809401306.

It is an arithmetic number, because the mean of its divisors is an integer number (358663234048).

Almost surely, 2^{2331311021221} is an apocalyptic number.

It is an amenable number.

2331311021221 is a deficient number, since it is larger than the sum of its proper divisors (537994851163).

2331311021221 is a wasteful number, since it uses less digits than its factorization.

2331311021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25618802451.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 2331311021221 its reverse (1221201131332), we get a palindrome (3552512152553).

The spelling of 2331311021221 in words is "two trillion, three hundred thirty-one billion, three hundred eleven million, twenty-one thousand, two hundred twenty-one".