21222002111111 has 4 divisors (see below), whose sum is σ = 21328645338000. Its totient is φ = 21115358884224.

The previous prime is 21222002111053. The next prime is 21222002111119. The reversal of 21222002111111 is 11111120022212.

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 21222002111111 - 2¹⁸ = 21222001848967 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222002111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222002111119) 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, 53321613146 + ... + 53321613543.

It is an arithmetic number, because the mean of its divisors is an integer number (5332161334500).

Almost surely, 2^{21222002111111} is an apocalyptic number.

21222002111111 is a deficient number, since it is larger than the sum of its proper divisors (106643226889).

21222002111111 is a wasteful number, since it uses less digits than its factorization.

21222002111111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106643226888.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 21222002111111 its reverse (11111120022212), we get a palindrome (32333122133323).

The spelling of 21222002111111 in words is "twenty-one trillion, two hundred twenty-two billion, two million, one hundred eleven thousand, one hundred eleven".