21200222002111 has 4 divisors (see below), whose sum is σ = 21352741585000. Its totient is φ = 21047702419224.

The previous prime is 21200222002051. The next prime is 21200222002129. The reversal of 21200222002111 is 11120022200212.

It is a happy number.

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 21200222002111 - 2²⁹ = 21199685131199 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 (21200282002111) 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, 76259791236 + ... + 76259791513.

It is an arithmetic number, because the mean of its divisors is an integer number (5338185396250).

Almost surely, 2^{21200222002111} is an apocalyptic number.

21200222002111 is a deficient number, since it is larger than the sum of its proper divisors (152519582889).

21200222002111 is a wasteful number, since it uses less digits than its factorization.

21200222002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152519582888.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21200222002111 its reverse (11120022200212), we get a palindrome (32320244202323).

It can be divided in two parts, 2120022200211 and 1, that added together give a palindrome (2120022200212).

The spelling of 21200222002111 in words is "twenty-one trillion, two hundred billion, two hundred twenty-two million, two thousand, one hundred eleven".