21222210200121 has 12 divisors (see below), whose sum is σ = 35033489854272. Its totient is φ = 12126977257176.

The previous prime is 21222210200119. The next prime is 21222210200123. The reversal of 21222210200121 is 12100201222212.

It is a happy number.

21222210200121 is a `hidden beast` number, since 2 + 122 + 221 + 0 + 200 + 121 = 666.

It is an interprime number because it is at equal distance from previous prime (21222210200119) and next prime (21222210200123).

It is not a de Polignac number, because 21222210200121 - 2¹ = 21222210200119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222210200094 and 21222210200103.

It is not an unprimeable number, because it can be changed into a prime (21222210200123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 168430239621 + ... + 168430239746.

It is an arithmetic number, because the mean of its divisors is an integer number (2919457487856).

Almost surely, 2^{21222210200121} is an apocalyptic number.

21222210200121 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222210200121 is a deficient number, since it is larger than the sum of its proper divisors (13811279654151).

21222210200121 is a wasteful number, since it uses less digits than its factorization.

21222210200121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336860479380 (or 336860479377 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21222210200121 its reverse (12100201222212), we get a palindrome (33322411422333).

The spelling of 21222210200121 in words is "twenty-one trillion, two hundred twenty-two billion, two hundred ten million, two hundred thousand, one hundred twenty-one".