12121111021011 has 16 divisors (see below), whose sum is σ = 16616754889728. Its totient is φ = 7854558465600.

The previous prime is 12121111020983. The next prime is 12121111021021. The reversal of 12121111021011 is 11012011112121.

It is not a de Polignac number, because 12121111021011 - 2¹⁹ = 12121110496723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12121111021021) 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, 181785151 + ... + 181851816.

It is an arithmetic number, because the mean of its divisors is an integer number (1038547180608).

Almost surely, 2^{12121111021011} is an apocalyptic number.

12121111021011 is a deficient number, since it is larger than the sum of its proper divisors (4495643868717).

12121111021011 is a wasteful number, since it uses less digits than its factorization.

12121111021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363637282.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 12121111021011 its reverse (11012011112121), we get a palindrome (23133122133132).

It can be divided in two parts, 121211110 and 21011, that added together give a palindrome (121232121).

The spelling of 12121111021011 in words is "twelve trillion, one hundred twenty-one billion, one hundred eleven million, twenty-one thousand, eleven".