121001111121111 has 32 divisors (see below), whose sum is σ = 175625457047040. Its totient is φ = 73657985606784.

The previous prime is 121001111121047. The next prime is 121001111121133. The reversal of 121001111121111 is 111121111100121.

It is a happy number.

It is not a de Polignac number, because 121001111121111 - 2⁶ = 121001111121047 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121001111120111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12962016 + ... + 20248853.

It is an arithmetic number, because the mean of its divisors is an integer number (5488295532720).

Almost surely, 2^{121001111121111} is an apocalyptic number.

121001111121111 is a deficient number, since it is larger than the sum of its proper divisors (54624345925929).

121001111121111 is a wasteful number, since it uses less digits than its factorization.

121001111121111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33211895.

The product of its (nonzero) digits is 4, while the sum is 15.

Adding to 121001111121111 its reverse (111121111100121), we get a palindrome (232122222221232).

The spelling of 121001111121111 in words is "one hundred twenty-one trillion, one billion, one hundred eleven million, one hundred twenty-one thousand, one hundred eleven".