21200100022111 has 4 divisors (see below), whose sum is σ = 22447164729312. Its totient is φ = 19953035314912.

The previous prime is 21200100022103. The next prime is 21200100022217. The reversal of 21200100022111 is 11122000100212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21200100022111 - 2³ = 21200100022103 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200100022091 and 21200100022100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200100022811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 623532353575 + ... + 623532353608.

It is an arithmetic number, because the mean of its divisors is an integer number (5611791182328).

Almost surely, 2^{21200100022111} is an apocalyptic number.

21200100022111 is a deficient number, since it is larger than the sum of its proper divisors (1247064707201).

21200100022111 is a wasteful number, since it uses less digits than its factorization.

21200100022111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247064707200.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21200100022111 its reverse (11122000100212), we get a palindrome (32322100122323).

The spelling of 21200100022111 in words is "twenty-one trillion, two hundred billion, one hundred million, twenty-two thousand, one hundred eleven".