20101220010111 has 12 divisors (see below), whose sum is σ = 26846446766552. Its totient is φ = 13378440648144.

The previous prime is 20101220010083. The next prime is 20101220010121. The reversal of 20101220010111 is 11101002210102.

It is not a de Polignac number, because 20101220010111 - 2³⁵ = 20066860271743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101220010121) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8260816 + ... + 10413621.

Almost surely, 2^{20101220010111} is an apocalyptic number.

20101220010111 is a deficient number, since it is larger than the sum of its proper divisors (6745226756441).

20101220010111 is an frugal number, since it uses more digits than its factorization.

20101220010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18675638 (or 18675039 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20101220010111 its reverse (11101002210102), we get a palindrome (31202222220213).

The spelling of 20101220010111 in words is "twenty trillion, one hundred one billion, two hundred twenty million, ten thousand, one hundred eleven".