20101211012111 has 16 divisors (see below), whose sum is σ = 22074328378368. Its totient is φ = 18221733129600.

The previous prime is 20101211012107. The next prime is 20101211012149. The reversal of 20101211012111 is 11121011210102.

It is a cyclic number.

It is not a de Polignac number, because 20101211012111 - 2² = 20101211012107 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 (20101211012611) 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, 90274385 + ... + 90496778.

It is an arithmetic number, because the mean of its divisors is an integer number (1379645523648).

Almost surely, 2^{20101211012111} is an apocalyptic number.

20101211012111 is a deficient number, since it is larger than the sum of its proper divisors (1973117366257).

20101211012111 is a wasteful number, since it uses less digits than its factorization.

20101211012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180771422.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 20101211012111 its reverse (11121011210102), we get a palindrome (31222222222213).

The spelling of 20101211012111 in words is "twenty trillion, one hundred one billion, two hundred eleven million, twelve thousand, one hundred eleven".