20102120102111 has 4 divisors (see below), whose sum is σ = 20225445992472. Its totient is φ = 19978794211752.

The previous prime is 20102120102083. The next prime is 20102120102123. The reversal of 20102120102111 is 11120102120102.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20102120102111 is a prime.

It is a super-2 number, since 2×20102120102111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20102120132111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61662944936 + ... + 61662945261.

It is an arithmetic number, because the mean of its divisors is an integer number (5056361498118).

Almost surely, 2^{20102120102111} is an apocalyptic number.

20102120102111 is a deficient number, since it is larger than the sum of its proper divisors (123325890361).

20102120102111 is a wasteful number, since it uses less digits than its factorization.

20102120102111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123325890360.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20102120102111 its reverse (11120102120102), we get a palindrome (31222222222213).

It can be divided in two parts, 20102120102 and 111, that multiplied together give a palindrome (2231335331322).

The spelling of 20102120102111 in words is "twenty trillion, one hundred two billion, one hundred twenty million, one hundred two thousand, one hundred eleven".