121221021211011 has 6 divisors (see below), whose sum is σ = 175097030638140. Its totient is φ = 80814014140668.

The previous prime is 121221021210983. The next prime is 121221021211013. The reversal of 121221021211011 is 110112120122121.

It is a happy number.

121221021211011 is a `hidden beast` number, since 1 + 212 + 210 + 21 + 211 + 0 + 11 = 666.

It is not a de Polignac number, because 121221021211011 - 2²⁶ = 121220954102147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121221021211013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6734501178381 + ... + 6734501178398.

It is an arithmetic number, because the mean of its divisors is an integer number (29182838439690).

Almost surely, 2^{121221021211011} is an apocalyptic number.

121221021211011 is a deficient number, since it is larger than the sum of its proper divisors (53876009427129).

121221021211011 is a wasteful number, since it uses less digits than its factorization.

121221021211011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13469002356785 (or 13469002356782 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 121221021211011 its reverse (110112120122121), we get a palindrome (231333141333132).

The spelling of 121221021211011 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty-one million, two hundred eleven thousand, eleven".