102012212221 has 4 divisors (see below), whose sum is σ = 102016909852. Its totient is φ = 102007514592.

The previous prime is 102012212201. The next prime is 102012212231. The reversal of 102012212221 is 122212210201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122212210201 = 2213 ⋅55224677.

It can be written as a sum of positive squares in 2 ways, for example, as 28768908996 + 73243303225 = 169614^2 + 270635^2 .

It is a cyclic number.

It is not a de Polignac number, because 102012212221 - 2¹¹ = 102012210173 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102012212195 and 102012212204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102012212201) 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, 2316090 + ... + 2359723.

It is an arithmetic number, because the mean of its divisors is an integer number (25504227463).

Almost surely, 2^102012212221 is an apocalyptic number.

It is an amenable number.

102012212221 is a deficient number, since it is larger than the sum of its proper divisors (4697631).

102012212221 is an equidigital number, since it uses as much as digits as its factorization.

102012212221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4697630.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 102012212221 its reverse (122212210201), we get a palindrome (224224422422).

The spelling of 102012212221 in words is "one hundred two billion, twelve million, two hundred twelve thousand, two hundred twenty-one".