11112021221 has 12 divisors (see below), whose sum is σ = 12891862368. Its totient is φ = 9382405032.

The previous prime is 11112021209. The next prime is 11112021227. The reversal of 11112021221 is 12212021111.

It is not a de Polignac number, because 11112021221 - 2¹⁸ = 11111759077 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11112021196 and 11112021205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11112021227) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145391 + ... + 208236.

It is an arithmetic number, because the mean of its divisors is an integer number (1074321864).

Almost surely, 2^11112021221 is an apocalyptic number.

It is an amenable number.

11112021221 is a deficient number, since it is larger than the sum of its proper divisors (1779841147).

11112021221 is an frugal number, since it uses more digits than its factorization.

11112021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353768 (or 353701 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 11112021221 its reverse (12212021111), we get a palindrome (23324042332).

The spelling of 11112021221 in words is "eleven billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".