2210121221 has 16 divisors (see below), whose sum is σ = 2875281408. Its totient is φ = 1647294000.

The previous prime is 2210121217. The next prime is 2210121239. The reversal of 2210121221 is 1221210122.

It is not a de Polignac number, because 2210121221 - 2² = 2210121217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2210121196 and 2210121205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210121281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 622205 + ... + 625746.

It is an arithmetic number, because the mean of its divisors is an integer number (179705088).

Almost surely, 2^2210121221 is an apocalyptic number.

It is an amenable number.

2210121221 is a deficient number, since it is larger than the sum of its proper divisors (665160187).

2210121221 is a wasteful number, since it uses less digits than its factorization.

2210121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247992.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 2210121221 is about 47011.9263698054. The cubic root of 2210121221 is about 1302.5828768998.

Adding to 2210121221 its reverse (1221210122), we get a palindrome (3431331343).

The spelling of 2210121221 in words is "two billion, two hundred ten million, one hundred twenty-one thousand, two hundred twenty-one".