21222002010121 has 4 divisors (see below), whose sum is σ = 23151274920144. Its totient is φ = 19292729100100.

The previous prime is 21222002010113. The next prime is 21222002010227. The reversal of 21222002010121 is 12101020022212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21222002010121 - 2³ = 21222002010113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222002010095 and 21222002010104.

It is not an unprimeable number, because it can be changed into a prime (21222002016121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 964636454995 + ... + 964636455016.

It is an arithmetic number, because the mean of its divisors is an integer number (5787818730036).

Almost surely, 2^{21222002010121} is an apocalyptic number.

It is an amenable number.

21222002010121 is a deficient number, since it is larger than the sum of its proper divisors (1929272910023).

21222002010121 is a wasteful number, since it uses less digits than its factorization.

21222002010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929272910022.

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

Adding to 21222002010121 its reverse (12101020022212), we get a palindrome (33323022032333).

The spelling of 21222002010121 in words is "twenty-one trillion, two hundred twenty-two billion, two million, ten thousand, one hundred twenty-one".