1111212202221 has 24 divisors (see below), whose sum is σ = 1751356772256. Its totient is φ = 673325123040.

The previous prime is 1111212202213. The next prime is 1111212202223. The reversal of 1111212202221 is 1222022121111.

It is not a de Polignac number, because 1111212202221 - 2³ = 1111212202213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1111212202194 and 1111212202203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111212202223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 649315 + ... + 1626048.

It is an arithmetic number, because the mean of its divisors is an integer number (72973198844).

Almost surely, 2^{1111212202221} is an apocalyptic number.

1111212202221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1111212202221 is a deficient number, since it is larger than the sum of its proper divisors (640144570035).

1111212202221 is a wasteful number, since it uses less digits than its factorization.

1111212202221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280313 (or 2280310 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1111212202221 its reverse (1222022121111), we get a palindrome (2333234323332).

The spelling of 1111212202221 in words is "one trillion, one hundred eleven billion, two hundred twelve million, two hundred two thousand, two hundred twenty-one".