221331311332 has 12 divisors (see below), whose sum is σ = 387450068796. Its totient is φ = 110631291680.

The previous prime is 221331311297. The next prime is 221331311389. The reversal of 221331311332 is 233113133122.

It can be written as a sum of positive squares in 2 ways, for example, as 146592499876 + 74738811456 = 382874^2 + 273384^2 .

It is a super-2 number, since 2×221331311332² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 221331311297 and 221331311306.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8576503 + ... + 8602270.

It is an arithmetic number, because the mean of its divisors is an integer number (32287505733).

Almost surely, 2^221331311332 is an apocalyptic number.

It is an amenable number.

221331311332 is a deficient number, since it is larger than the sum of its proper divisors (166118757464).

221331311332 is a wasteful number, since it uses less digits than its factorization.

221331311332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17181998 (or 17181996 counting only the distinct ones).

The product of its digits is 1944, while the sum is 25.

Adding to 221331311332 its reverse (233113133122), we get a palindrome (454444444454).

The spelling of 221331311332 in words is "two hundred twenty-one billion, three hundred thirty-one million, three hundred eleven thousand, three hundred thirty-two".