21222010220121 has 64 divisors (see below), whose sum is σ = 33812383334400. Its totient is φ = 13123427347008.

The previous prime is 21222010220101. The next prime is 21222010220207. The reversal of 21222010220121 is 12102201022212.

It is a happy number.

21222010220121 is a `hidden beast` number, since 2 + 122 + 201 + 0 + 220 + 121 = 666.

It is not a de Polignac number, because 21222010220121 - 2³⁰ = 21220936478297 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222010220094 and 21222010220103.

It is not an unprimeable number, because it can be changed into a prime (21222010220101) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 153961 + ... + 6516726.

It is an arithmetic number, because the mean of its divisors is an integer number (528318489600).

Almost surely, 2^{21222010220121} is an apocalyptic number.

It is an amenable number.

21222010220121 is a deficient number, since it is larger than the sum of its proper divisors (12590373114279).

21222010220121 is a wasteful number, since it uses less digits than its factorization.

21222010220121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6670875 (or 6670869 counting only the distinct ones).

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

Adding to 21222010220121 its reverse (12102201022212), we get a palindrome (33324211242333).

The spelling of 21222010220121 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, two hundred twenty thousand, one hundred twenty-one".