21200212111 has 8 divisors (see below), whose sum is σ = 23217964560. Its totient is φ = 19237740672.

The previous prime is 21200212043. The next prime is 21200212123. The reversal of 21200212111 is 11121200212.

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

It is a cyclic number.

It is not a de Polignac number, because 21200212111 - 2¹³ = 21200203919 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200212091 and 21200212100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200212511) 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, 13819450 + ... + 13820983.

It is an arithmetic number, because the mean of its divisors is an integer number (2902245570).

Almost surely, 2^21200212111 is an apocalyptic number.

21200212111 is a deficient number, since it is larger than the sum of its proper divisors (2017752449).

21200212111 is a wasteful number, since it uses less digits than its factorization.

21200212111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27640505.

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

Adding to 21200212111 its reverse (11121200212), we get a palindrome (32321412323).

It can be divided in two parts, 21200212 and 111, that multiplied together give a palindrome (2353223532).

The spelling of 21200212111 in words is "twenty-one billion, two hundred million, two hundred twelve thousand, one hundred eleven".