121221020221111 has 8 divisors (see below), whose sum is σ = 121324192602624. Its totient is φ = 121117849607160.

The previous prime is 121221020221099. The next prime is 121221020221139. The reversal of 121221020221111 is 111122020122121.

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 not a de Polignac number, because 121221020221111 - 2¹¹ = 121221020219063 is a prime.

It is a super-4 number, since 4×121221020221111⁴ (a number of 57 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121221020221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162202266 + ... + 162947896.

It is an arithmetic number, because the mean of its divisors is an integer number (15165524075328).

Almost surely, 2^{121221020221111} is an apocalyptic number.

121221020221111 is a deficient number, since it is larger than the sum of its proper divisors (103172381513).

121221020221111 is a wasteful number, since it uses less digits than its factorization.

121221020221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883781.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 121221020221111 its reverse (111122020122121), we get a palindrome (232343040343232).

The spelling of 121221020221111 in words is "one hundred twenty-one trillion, two hundred twenty-one billion, twenty million, two hundred twenty-one thousand, one hundred eleven".