221131012 has 6 divisors (see below), whose sum is σ = 386979278. Its totient is φ = 110565504.

The previous prime is 221130977. The next prime is 221131073. The reversal of 221131012 is 210131122.

It can be written as a sum of positive squares in only one way, i.e., 201185856 + 19945156 = 14184^2 + 4466^2 .

It is a junction number, because it is equal to n+sod(n) for n = 221130983 and 221131001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27641373 + ... + 27641380.

Almost surely, 2^221131012 is an apocalyptic number.

It is an amenable number.

221131012 is a deficient number, since it is larger than the sum of its proper divisors (165848266).

221131012 is a wasteful number, since it uses less digits than its factorization.

221131012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55282757 (or 55282755 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 221131012 is about 14870.4745048704. The cubic root of 221131012 is about 604.7138067646.

Adding to 221131012 its reverse (210131122), we get a palindrome (431262134).

The spelling of 221131012 in words is "two hundred twenty-one million, one hundred thirty-one thousand, twelve".