21200111101011 has 32 divisors (see below), whose sum is σ = 30944774779200. Its totient is φ = 12855653462016.

The previous prime is 21200111100991. The next prime is 21200111101027. The reversal of 21200111101011 is 11010111100212.

It is not a de Polignac number, because 21200111101011 - 2²³ = 21200102712403 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200111101031) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37419586 + ... + 37981911.

It is an arithmetic number, because the mean of its divisors is an integer number (967024211850).

Almost surely, 2^{21200111101011} is an apocalyptic number.

21200111101011 is a deficient number, since it is larger than the sum of its proper divisors (9744663678189).

21200111101011 is a wasteful number, since it uses less digits than its factorization.

21200111101011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75401703.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 21200111101011 its reverse (11010111100212), we get a palindrome (32210222201223).

The spelling of 21200111101011 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, one hundred one thousand, eleven".