121111111012011 has 16 divisors (see below), whose sum is σ = 163204568995104. Its totient is φ = 79879792057344.

The previous prime is 121111111011991. The next prime is 121111111012037. The reversal of 121111111012011 is 110210111111121.

It is a happy number.

It is not a de Polignac number, because 121111111012011 - 2³⁸ = 120836233105067 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121111111012091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73585320 + ... + 75213173.

It is an arithmetic number, because the mean of its divisors is an integer number (10200285562194).

Almost surely, 2^{121111111012011} is an apocalyptic number.

121111111012011 is a deficient number, since it is larger than the sum of its proper divisors (42093457983093).

121111111012011 is a wasteful number, since it uses less digits than its factorization.

121111111012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148801390.

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

Adding to 121111111012011 its reverse (110210111111121), we get a palindrome (231321222123132).

The spelling of 121111111012011 in words is "one hundred twenty-one trillion, one hundred eleven billion, one hundred eleven million, twelve thousand, eleven".