2210221221 has 32 divisors (see below), whose sum is σ = 3368534400. Its totient is φ = 1277005824.

The previous prime is 2210221217. The next prime is 2210221241. The reversal of 2210221221 is 1221220122.

2210221221 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2210221221 - 2² = 2210221217 is a prime.

2210221221 is a modest number, since divided by 221221 gives 2210 as remainder.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2210221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210221241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 283230 + ... + 290928.

It is an arithmetic number, because the mean of its divisors is an integer number (105266700).

Almost surely, 2^2210221221 is an apocalyptic number.

It is an amenable number.

2210221221 is a deficient number, since it is larger than the sum of its proper divisors (1158313179).

2210221221 is a wasteful number, since it uses less digits than its factorization.

2210221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8165.

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 2210221221 is about 47012.9899176813. The cubic root of 2210221221 is about 1302.6025223265.

Adding to 2210221221 its reverse (1221220122), we get a palindrome (3431441343).

The spelling of 2210221221 in words is "two billion, two hundred ten million, two hundred twenty-one thousand, two hundred twenty-one".