1222200121221 has 12 divisors (see below), whose sum is σ = 1794341162380. Its totient is φ = 801442702080.

The previous prime is 1222200121201. The next prime is 1222200121223. The reversal of 1222200121221 is 1221210022221.

It is a happy number.

1222200121221 is a `hidden beast` number, since 1 + 222 + 200 + 1 + 21 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 45005501025 + 1177194620196 = 212145^2 + 1084986^2 .

It is not a de Polignac number, because 1222200121221 - 2⁵ = 1222200121189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1222200121194 and 1222200121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1222200121223) 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, 1113114316 + ... + 1113115413.

Almost surely, 2^{1222200121221} is an apocalyptic number.

It is an amenable number.

1222200121221 is a deficient number, since it is larger than the sum of its proper divisors (572141041159).

1222200121221 is a wasteful number, since it uses less digits than its factorization.

1222200121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2226229796 (or 2226229793 counting only the distinct ones).

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

Adding to 1222200121221 its reverse (1221210022221), we get a palindrome (2443410143442).

The spelling of 1222200121221 in words is "one trillion, two hundred twenty-two billion, two hundred million, one hundred twenty-one thousand, two hundred twenty-one".