121002111111 has 12 divisors (see below), whose sum is σ = 187676743992. Its totient is φ = 69144063408.

The previous prime is 121002111107. The next prime is 121002111127. The reversal of 121002111111 is 111111200121.

It is not a de Polignac number, because 121002111111 - 2² = 121002111107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121002111011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 411571660 + ... + 411571953.

It is an arithmetic number, because the mean of its divisors is an integer number (15639728666).

Almost surely, 2^121002111111 is an apocalyptic number.

121002111111 is a deficient number, since it is larger than the sum of its proper divisors (66674632881).

121002111111 is an equidigital number, since it uses as much as digits as its factorization.

121002111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 823143630 (or 823143623 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 121002111111 its reverse (111111200121), we get a palindrome (232113311232).

The spelling of 121002111111 in words is "one hundred twenty-one billion, two million, one hundred eleven thousand, one hundred eleven".