121001111111111 has 24 divisors (see below), whose sum is σ = 153553356132480. Its totient is φ = 94286011671600.

The previous prime is 121001111111011. The next prime is 121001111111123. The reversal of 121001111111111 is 111111111100121.

It is not a de Polignac number, because 121001111111111 - 2⁴² = 116603064600007 is a prime.

It is a Duffinian number.

121001111111111 is a modest number, since divided by 11111111 gives 1210011 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001111111171) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103748396 + ... + 104908206.

It is an arithmetic number, because the mean of its divisors is an integer number (6398056505520).

Almost surely, 2^{121001111111111} is an apocalyptic number.

121001111111111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121001111111111 is a deficient number, since it is larger than the sum of its proper divisors (32552245021369).

121001111111111 is a wasteful number, since it uses less digits than its factorization.

121001111111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1353395 (or 1353388 counting only the distinct ones).

The product of its (nonzero) digits is 2, while the sum is 14.

Adding to 121001111111111 its reverse (111111111100121), we get a palindrome (232112222211232).

The spelling of 121001111111111 in words is "one hundred twenty-one trillion, one billion, one hundred eleven million, one hundred eleven thousand, one hundred eleven".