21011212200111 has 16 divisors (see below), whose sum is σ = 32882411887104. Its totient is φ = 11681909485344.

The previous prime is 21011212200073. The next prime is 21011212200119. The reversal of 21011212200111 is 11100221211012.

It is a happy number.

It is not a de Polignac number, because 21011212200111 - 2²⁵ = 21011178645679 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21011212200119) 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, 13520727795 + ... + 13520729348.

It is an arithmetic number, because the mean of its divisors is an integer number (2055150742944).

Almost surely, 2^{21011212200111} is an apocalyptic number.

21011212200111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21011212200111 is a deficient number, since it is larger than the sum of its proper divisors (11871199686993).

21011212200111 is a wasteful number, since it uses less digits than its factorization.

21011212200111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27041457190.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21011212200111 its reverse (11100221211012), we get a palindrome (32111433411123).

The spelling of 21011212200111 in words is "twenty-one trillion, eleven billion, two hundred twelve million, two hundred thousand, one hundred eleven".