121001113311111 has 12 divisors (see below), whose sum is σ = 190668420975240. Its totient is φ = 73334008067280.

The previous prime is 121001113311077. The next prime is 121001113311131. The reversal of 121001113311111 is 111113311100121.

It is a happy number.

121001113311111 is a `hidden beast` number, since 1 + 210 + 0 + 1 + 11 + 331 + 1 + 111 = 666.

It is not a de Polignac number, because 121001113311111 - 2⁷ = 121001113310983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001113311131) 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, 611116733796 + ... + 611116733993.

It is an arithmetic number, because the mean of its divisors is an integer number (15889035081270).

Almost surely, 2^{121001113311111} is an apocalyptic number.

121001113311111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

121001113311111 is a deficient number, since it is larger than the sum of its proper divisors (69667307664129).

121001113311111 is a wasteful number, since it uses less digits than its factorization.

121001113311111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222233467806 (or 1222233467803 counting only the distinct ones).

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

Adding to 121001113311111 its reverse (111113311100121), we get a palindrome (232114424411232).

The spelling of 121001113311111 in words is "one hundred twenty-one trillion, one billion, one hundred thirteen million, three hundred eleven thousand, one hundred eleven".