1101212112221 has 8 divisors (see below), whose sum is σ = 1186249023960. Its totient is φ = 1016222098752.

The previous prime is 1101212112163. The next prime is 1101212112223. The reversal of 1101212112221 is 1222112121011.

It can be written as a sum of positive squares in 4 ways, for example, as 2360988100 + 1098851124121 = 48590^2 + 1048261^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1101212112221 - 2⁶ = 1101212112157 is a prime.

It is a super-2 number, since 2×1101212112221² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1101212112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1101212112223) 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 7 ways as a sum of consecutive naturals, for example, 11675786 + ... + 11769723.

It is an arithmetic number, because the mean of its divisors is an integer number (148281127995).

Almost surely, 2^{1101212112221} is an apocalyptic number.

It is an amenable number.

1101212112221 is a deficient number, since it is larger than the sum of its proper divisors (85036911739).

1101212112221 is a wasteful number, since it uses less digits than its factorization.

1101212112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23449135.

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

Adding to 1101212112221 its reverse (1222112121011), we get a palindrome (2323324233232).

The spelling of 1101212112221 in words is "one trillion, one hundred one billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".