221331311331 has 16 divisors (see below), whose sum is σ = 318893751456. Its totient is φ = 135739017216.

The previous prime is 221331311297. The next prime is 221331311389. The reversal of 221331311331 is 133113133122.

It is not a de Polignac number, because 221331311331 - 2¹³ = 221331303139 is a prime.

It is a super-2 number, since 2×221331311331² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (221331319331) 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, 9673150 + ... + 9696003.

It is an arithmetic number, because the mean of its divisors is an integer number (19930859466).

Almost surely, 2^221331311331 is an apocalyptic number.

221331311331 is a deficient number, since it is larger than the sum of its proper divisors (97562440125).

221331311331 is a wasteful number, since it uses less digits than its factorization.

221331311331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19369462.

The product of its digits is 972, while the sum is 24.

Adding to 221331311331 its reverse (133113133122), we get a palindrome (354444444453).

The spelling of 221331311331 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred eleven thousand, three hundred thirty-one".