2210121211221 has 48 divisors (see below), whose sum is σ = 4117377663360. Its totient is φ = 1108524735360.

The previous prime is 2210121211169. The next prime is 2210121211231. The reversal of 2210121211221 is 1221121210122.

2210121211221 is a `hidden beast` number, since 2 + 210 + 1 + 21 + 211 + 221 = 666.

2210121211221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2210121211221 - 2⁷ = 2210121211093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2210121211194 and 2210121211203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2210121211231) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54966250 + ... + 55006443.

It is an arithmetic number, because the mean of its divisors is an integer number (85778701320).

Almost surely, 2^{2210121211221} is an apocalyptic number.

2210121211221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2210121211221 is a deficient number, since it is larger than the sum of its proper divisors (1907256452139).

2210121211221 is a wasteful number, since it uses less digits than its factorization.

2210121211221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109972746 (or 109972743 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 2210121211221 its reverse (1221121210122), we get a palindrome (3431242421343).

The spelling of 2210121211221 in words is "two trillion, two hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, two hundred twenty-one".