20102111211111 has 32 divisors (see below), whose sum is σ = 28477150952640. Its totient is φ = 12589260558336.

The previous prime is 20102111211103. The next prime is 20102111211121. The reversal of 20102111211111 is 11111211120102.

It is not a de Polignac number, because 20102111211111 - 2³ = 20102111211103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102111211101) 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, 244400085 + ... + 244482321.

It is an arithmetic number, because the mean of its divisors is an integer number (889910967270).

Almost surely, 2^{20102111211111} is an apocalyptic number.

20102111211111 is a deficient number, since it is larger than the sum of its proper divisors (8375039741529).

20102111211111 is a wasteful number, since it uses less digits than its factorization.

20102111211111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158243.

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

Adding to 20102111211111 its reverse (11111211120102), we get a palindrome (31213322331213).

The spelling of 20102111211111 in words is "twenty trillion, one hundred two billion, one hundred eleven million, two hundred eleven thousand, one hundred eleven".