121021201220111 has 4 divisors (see below), whose sum is σ = 125194346089800. Its totient is φ = 116848056350424.

The previous prime is 121021201220107. The next prime is 121021201220141. The reversal of 121021201220111 is 111022102120121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 121021201220111 - 2² = 121021201220107 is a prime.

It is a super-2 number, since 2×121021201220111² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121021201220111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121021201220141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2086572434801 + ... + 2086572434858.

It is an arithmetic number, because the mean of its divisors is an integer number (31298586522450).

Almost surely, 2^{121021201220111} is an apocalyptic number.

121021201220111 is a deficient number, since it is larger than the sum of its proper divisors (4173144869689).

121021201220111 is an equidigital number, since it uses as much as digits as its factorization.

121021201220111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4173144869688.

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

Adding to 121021201220111 its reverse (111022102120121), we get a palindrome (232043303340232).

The spelling of 121021201220111 in words is "one hundred twenty-one trillion, twenty-one billion, two hundred one million, two hundred twenty thousand, one hundred eleven".