102223121221 has 4 divisors (see below), whose sum is σ = 110086438252. Its totient is φ = 94359804192.

The previous prime is 102223121201. The next prime is 102223121251. The reversal of 102223121221 is 122121322201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 122121322201 = 47609 ⋅2565089.

It can be written as a sum of positive squares in 2 ways, for example, as 6510230596 + 95712890625 = 80686^2 + 309375^2 .

It is a cyclic number.

It is not a de Polignac number, because 102223121221 - 2¹⁵ = 102223088453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102223121201) 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, 3931658496 + ... + 3931658521.

It is an arithmetic number, because the mean of its divisors is an integer number (27521609563).

Almost surely, 2^102223121221 is an apocalyptic number.

It is an amenable number.

102223121221 is a deficient number, since it is larger than the sum of its proper divisors (7863317031).

102223121221 is an equidigital number, since it uses as much as digits as its factorization.

102223121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7863317030.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 102223121221 its reverse (122121322201), we get a palindrome (224344443422).

The spelling of 102223121221 in words is "one hundred two billion, two hundred twenty-three million, one hundred twenty-one thousand, two hundred twenty-one".