20010121010111 has 4 divisors (see below), whose sum is σ = 20011986070800. Its totient is φ = 20008255949424.

The previous prime is 20010121010041. The next prime is 20010121010123. The reversal of 20010121010111 is 11101012101002.

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

It is a cyclic number.

It is not a de Polignac number, because 20010121010111 - 2¹⁴ = 20010120993727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010121010092 and 20010121010101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010121010161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 932514251 + ... + 932535708.

It is an arithmetic number, because the mean of its divisors is an integer number (5002996517700).

Almost surely, 2^{20010121010111} is an apocalyptic number.

20010121010111 is a deficient number, since it is larger than the sum of its proper divisors (1865060689).

20010121010111 is a wasteful number, since it uses less digits than its factorization.

20010121010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1865060688.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 20010121010111 its reverse (11101012101002), we get a palindrome (31111133111113).

It can be divided in two parts, 20010 and 121010111, that added together give a palindrome (121030121).

The spelling of 20010121010111 in words is "twenty trillion, ten billion, one hundred twenty-one million, ten thousand, one hundred eleven".