21222101121 has 16 divisors (see below), whose sum is σ = 30494620800. Its totient is φ = 13050385920.

The previous prime is 21222101119. The next prime is 21222101161. The reversal of 21222101121 is 12110122212.

It is not a de Polignac number, because 21222101121 - 2¹ = 21222101119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21222101121.

It is not an unprimeable number, because it can be changed into a prime (21222101101) 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, 139920 + ... + 249041.

It is an arithmetic number, because the mean of its divisors is an integer number (1905913800).

Almost surely, 2^21222101121 is an apocalyptic number.

It is an amenable number.

21222101121 is a deficient number, since it is larger than the sum of its proper divisors (9272519679).

21222101121 is a wasteful number, since it uses less digits than its factorization.

21222101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390376.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21222101121 its reverse (12110122212), we get a palindrome (33332223333).

The spelling of 21222101121 in words is "twenty-one billion, two hundred twenty-two million, one hundred one thousand, one hundred twenty-one".