21222120311121 has 16 divisors (see below), whose sum is σ = 28343677310208. Its totient is φ = 14124337827600.

The previous prime is 21222120311087. The next prime is 21222120311123. The reversal of 21222120311121 is 12111302122212.

It is a de Polignac number, because none of the positive numbers 2^k-21222120311121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21222120311123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3280006 + ... + 7294016.

It is an arithmetic number, because the mean of its divisors is an integer number (1771479831888).

Almost surely, 2^{21222120311121} is an apocalyptic number.

It is an amenable number.

21222120311121 is a deficient number, since it is larger than the sum of its proper divisors (7121556999087).

21222120311121 is a wasteful number, since it uses less digits than its factorization.

21222120311121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4016972.

The product of its (nonzero) digits is 192, while the sum is 21.

Adding to 21222120311121 its reverse (12111302122212), we get a palindrome (33333422433333).

The spelling of 21222120311121 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred twenty million, three hundred eleven thousand, one hundred twenty-one".