221011012 has 6 divisors (see below), whose sum is σ = 386769278. Its totient is φ = 110505504.

The previous prime is 221010971. The next prime is 221011057. The reversal of 221011012 is 210110122.

It can be written as a sum of positive squares in only one way, i.e., 164249856 + 56761156 = 12816^2 + 7534^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 221011012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27626373 + ... + 27626380.

Almost surely, 2^221011012 is an apocalyptic number.

It is an amenable number.

221011012 is a deficient number, since it is larger than the sum of its proper divisors (165758266).

221011012 is a wasteful number, since it uses less digits than its factorization.

221011012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55252757 (or 55252755 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 221011012 is about 14866.4391163452. The cubic root of 221011012 is about 604.6044013547.

Adding to 221011012 its reverse (210110122), we get a palindrome (431121134).

It can be divided in two parts, 2210110 and 12, that added together give a palindrome (2210122).

The spelling of 221011012 in words is "two hundred twenty-one million, eleven thousand, twelve".