2111210122221 has 12 divisors (see below), whose sum is σ = 3131945346972. Its totient is φ = 1369433592576.

The previous prime is 2111210122207. The next prime is 2111210122271. The reversal of 2111210122221 is 1222210121112.

2111210122221 is a `hidden beast` number, since 2 + 111 + 210 + 122 + 221 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1485987818121 + 625222304100 = 1219011^2 + 790710^2 .

It is not a de Polignac number, because 2111210122221 - 2⁶ = 2111210122157 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2111210122194 and 2111210122203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111210122271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3169984836 + ... + 3169985501.

It is an arithmetic number, because the mean of its divisors is an integer number (260995445581).

Almost surely, 2^{2111210122221} is an apocalyptic number.

It is an amenable number.

2111210122221 is a deficient number, since it is larger than the sum of its proper divisors (1020735224751).

2111210122221 is a wasteful number, since it uses less digits than its factorization.

2111210122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6339970380 (or 6339970377 counting only the distinct ones).

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

Adding to 2111210122221 its reverse (1222210121112), we get a palindrome (3333420243333).

The spelling of 2111210122221 in words is "two trillion, one hundred eleven billion, two hundred ten million, one hundred twenty-two thousand, two hundred twenty-one".