102212112221 has 4 divisors (see below), whose sum is σ = 102356276700. Its totient is φ = 102067947744.

The previous prime is 102212112151. The next prime is 102212112229. The reversal of 102212112221 is 122211212201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122211212201 = 13 ⋅9400862477.

It can be written as a sum of positive squares in 2 ways, for example, as 55819260121 + 46392852100 = 236261^2 + 215390^2 .

It is a cyclic number.

It is not a de Polignac number, because 102212112221 - 2¹⁴ = 102212095837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 102212112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102212112229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72081176 + ... + 72082593.

It is an arithmetic number, because the mean of its divisors is an integer number (25589069175).

Almost surely, 2^102212112221 is an apocalyptic number.

It is an amenable number.

102212112221 is a deficient number, since it is larger than the sum of its proper divisors (144164479).

102212112221 is an equidigital number, since it uses as much as digits as its factorization.

102212112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144164478.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 102212112221 its reverse (122211212201), we get a palindrome (224423324422).

The spelling of 102212112221 in words is "one hundred two billion, two hundred twelve million, one hundred twelve thousand, two hundred twenty-one".