20012211221111 has 16 divisors (see below), whose sum is σ = 20667453004800. Its totient is φ = 19357576939200.

The previous prime is 20012211221063. The next prime is 20012211221129. The reversal of 20012211221111 is 11112211221002.

It is a cyclic number.

It is not a de Polignac number, because 20012211221111 - 2¹⁰ = 20012211220087 is a prime.

It is a super-2 number, since 2×20012211221111² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20012211221111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012211221411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 877293896 + ... + 877316706.

It is an arithmetic number, because the mean of its divisors is an integer number (1291715812800).

Almost surely, 2^{20012211221111} is an apocalyptic number.

20012211221111 is a deficient number, since it is larger than the sum of its proper divisors (655241783689).

20012211221111 is a wasteful number, since it uses less digits than its factorization.

20012211221111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34870.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 20012211221111 its reverse (11112211221002), we get a palindrome (31124422442113).

The spelling of 20012211221111 in words is "twenty trillion, twelve billion, two hundred eleven million, two hundred twenty-one thousand, one hundred eleven".