121011111211221 has 160 divisors (see below), whose sum is σ = 226793571840000. Its totient is φ = 62468346856320.

The previous prime is 121011111211201. The next prime is 121011111211253. The reversal of 121011111211221 is 122112111110121.

121011111211221 is a `hidden beast` number, since 1 + 210 + 1 + 11 + 11 + 211 + 221 = 666.

It is not a de Polignac number, because 121011111211221 - 2⁹ = 121011111210709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121011111211194 and 121011111211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121011111211201) by changing a digit.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 746905780 + ... + 747067778.

It is an arithmetic number, because the mean of its divisors is an integer number (1417459824000).

Almost surely, 2^{121011111211221} is an apocalyptic number.

121011111211221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121011111211221 is a deficient number, since it is larger than the sum of its proper divisors (105782460628779).

121011111211221 is a wasteful number, since it uses less digits than its factorization.

121011111211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162781 (or 162772 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 121011111211221 its reverse (122112111110121), we get a palindrome (243123222321342).

The spelling of 121011111211221 in words is "one hundred twenty-one trillion, eleven billion, one hundred eleven million, two hundred eleven thousand, two hundred twenty-one".