21200120010111 has 8 divisors (see below), whose sum is σ = 32304944777344. Its totient is φ = 12114354291480.

The previous prime is 21200120010089. The next prime is 21200120010143. The reversal of 21200120010111 is 11101002100212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21200120010111 - 2⁷ = 21200120009983 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 (21200120010191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504764762125 + ... + 504764762166.

It is an arithmetic number, because the mean of its divisors is an integer number (4038118097168).

Almost surely, 2^{21200120010111} is an apocalyptic number.

21200120010111 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21200120010111 is a deficient number, since it is larger than the sum of its proper divisors (11104824767233).

21200120010111 is a wasteful number, since it uses less digits than its factorization.

21200120010111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009529524301.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21200120010111 its reverse (11101002100212), we get a palindrome (32301122110323).

The spelling of 21200120010111 in words is "twenty-one trillion, two hundred billion, one hundred twenty million, ten thousand, one hundred eleven".