1111222101221 has 16 divisors (see below), whose sum is σ = 1150918359360. Its totient is φ = 1072159079040.

The previous prime is 1111222101113. The next prime is 1111222101233. The reversal of 1111222101221 is 1221012221111.

It is a cyclic number.

It is not a de Polignac number, because 1111222101221 - 2²² = 1111217906917 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1111222101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111222101251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34678235 + ... + 34710263.

It is an arithmetic number, because the mean of its divisors is an integer number (71932397460).

Almost surely, 2^{1111222101221} is an apocalyptic number.

It is an amenable number.

1111222101221 is a deficient number, since it is larger than the sum of its proper divisors (39696258139).

1111222101221 is an equidigital number, since it uses as much as digits as its factorization.

1111222101221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41876.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 1111222101221 its reverse (1221012221111), we get a palindrome (2332234322332).

The spelling of 1111222101221 in words is "one trillion, one hundred eleven billion, two hundred twenty-two million, one hundred one thousand, two hundred twenty-one".