2220210121221 has 12 divisors (see below), whose sum is σ = 3250901274348. Its totient is φ = 1459864188864.

The previous prime is 2220210121201. The next prime is 2220210121249. The reversal of 2220210121221 is 1221210120222.

It is a happy number.

2220210121221 is a `hidden beast` number, since 2 + 220 + 210 + 1 + 212 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1839997296225 + 380212824996 = 1356465^2 + 616614^2 .

It is not a de Polignac number, because 2220210121221 - 2¹⁰ = 2220210120197 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2220210121194 and 2220210121203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220210121201) 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, 1689656970 + ... + 1689658283.

It is an arithmetic number, because the mean of its divisors is an integer number (270908439529).

Almost surely, 2^{2220210121221} is an apocalyptic number.

It is an amenable number.

2220210121221 is a deficient number, since it is larger than the sum of its proper divisors (1030691153127).

2220210121221 is a wasteful number, since it uses less digits than its factorization.

2220210121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379315332 (or 3379315329 counting only the distinct ones).

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

Adding to 2220210121221 its reverse (1221210120222), we get a palindrome (3441420241443).

Subtracting from 2220210121221 its reverse (1221210120222), we obtain a palindrome (999000000999).

The spelling of 2220210121221 in words is "two trillion, two hundred twenty billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".