21222102121 has 16 divisors (see below), whose sum is σ = 23409000000. Its totient is φ = 19078778880.

The previous prime is 21222102107. The next prime is 21222102149. The reversal of 21222102121 is 12120122212.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21222102121 - 2¹³ = 21222093929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222102095 and 21222102104.

It is not an unprimeable number, because it can be changed into a prime (21222102221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 663505 + ... + 694753.

It is an arithmetic number, because the mean of its divisors is an integer number (1463062500).

Almost surely, 2^21222102121 is an apocalyptic number.

It is an amenable number.

21222102121 is a deficient number, since it is larger than the sum of its proper divisors (2186897879).

21222102121 is a wasteful number, since it uses less digits than its factorization.

21222102121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31944.

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

Adding to 21222102121 its reverse (12120122212), we get a palindrome (33342224333).

The spelling of 21222102121 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, one hundred twenty-one".