20122121011111 has 24 divisors (see below), whose sum is σ = 23859846141264. Its totient is φ = 16914420956160.

The previous prime is 20122121011103. The next prime is 20122121011117. The reversal of 20122121011111 is 11111012122102.

It is not a de Polignac number, because 20122121011111 - 2³ = 20122121011103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20122121011117) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3962631 + ... + 7479751.

It is an arithmetic number, because the mean of its divisors is an integer number (994160255886).

Almost surely, 2^{20122121011111} is an apocalyptic number.

20122121011111 is a deficient number, since it is larger than the sum of its proper divisors (3737725130153).

20122121011111 is a wasteful number, since it uses less digits than its factorization.

20122121011111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3519391 (or 3519384 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 20122121011111 its reverse (11111012122102), we get a palindrome (31233133133213).

The spelling of 20122121011111 in words is "twenty trillion, one hundred twenty-two billion, one hundred twenty-one million, eleven thousand, one hundred eleven".