11012215221 has 32 divisors (see below), whose sum is σ = 18781159680. Its totient is φ = 6246747648.

The previous prime is 11012215217. The next prime is 11012215223. The reversal of 11012215221 is 12251221011.

11012215221 is a `hidden beast` number, since 110 + 12 + 21 + 522 + 1 = 666.

It is not a de Polignac number, because 11012215221 - 2² = 11012215217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11012215194 and 11012215203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11012215223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186756 + ... + 238541.

It is an arithmetic number, because the mean of its divisors is an integer number (586911240).

Almost surely, 2^11012215221 is an apocalyptic number.

It is an amenable number.

11012215221 is a deficient number, since it is larger than the sum of its proper divisors (7768944459).

11012215221 is a wasteful number, since it uses less digits than its factorization.

11012215221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425450 (or 425444 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 18.

Adding to 11012215221 its reverse (12251221011), we get a palindrome (23263436232).

The spelling of 11012215221 in words is "eleven billion, twelve million, two hundred fifteen thousand, two hundred twenty-one".