121221021221111 has 8 divisors (see below), whose sum is σ = 138538893183264. Its totient is φ = 103903295063040.

The previous prime is 121221021221093. The next prime is 121221021221117. The reversal of 121221021221111 is 111122120122121.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121221021221111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221021221117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34663610 + ... + 38000103.

It is an arithmetic number, because the mean of its divisors is an integer number (17317361647908).

Almost surely, 2^{121221021221111} is an apocalyptic number.

121221021221111 is a deficient number, since it is larger than the sum of its proper divisors (17317871962153).

121221021221111 is an equidigital number, since it uses as much as digits as its factorization.

121221021221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72902041.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 121221021221111 its reverse (111122120122121), we get a palindrome (232343141343232).

The spelling of 121221021221111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one hundred eleven".