20010212111 has 4 divisors (see below), whose sum is σ = 20142730224. Its totient is φ = 19877694000.

The previous prime is 20010212093. The next prime is 20010212147. The reversal of 20010212111 is 11121201002.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11121201002 = 2 ⋅5560600501.

It is a cyclic number.

It is not a de Polignac number, because 20010212111 - 2¹⁰ = 20010211087 is a prime.

It is a super-2 number, since 2×20010212111² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010212092 and 20010212101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010212611) 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, 66258830 + ... + 66259131.

It is an arithmetic number, because the mean of its divisors is an integer number (5035682556).

Almost surely, 2^20010212111 is an apocalyptic number.

20010212111 is a deficient number, since it is larger than the sum of its proper divisors (132518113).

20010212111 is a wasteful number, since it uses less digits than its factorization.

20010212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132518112.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20010212111 its reverse (11121201002), we get a palindrome (31131413113).

The spelling of 20010212111 in words is "twenty billion, ten million, two hundred twelve thousand, one hundred eleven".