21000200111111 has 12 divisors (see below), whose sum is σ = 22761294333480. Its totient is φ = 19366529626080.

The previous prime is 21000200111039. The next prime is 21000200111123. The reversal of 21000200111111 is 11111100200012.

It is a de Polignac number, because none of the positive numbers 2^k-21000200111111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000200111092 and 21000200111101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000200111131) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58379381 + ... + 58737998.

It is an arithmetic number, because the mean of its divisors is an integer number (1896774527790).

Almost surely, 2^{21000200111111} is an apocalyptic number.

21000200111111 is a deficient number, since it is larger than the sum of its proper divisors (1761094222369).

21000200111111 is a wasteful number, since it uses less digits than its factorization.

21000200111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117118466 (or 117118453 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21000200111111 its reverse (11111100200012), we get a palindrome (32111300311123).

The spelling of 21000200111111 in words is "twenty-one trillion, two hundred million, one hundred eleven thousand, one hundred eleven".