102222521 has 4 divisors (see below), whose sum is σ = 102620532. Its totient is φ = 101824512.

The previous prime is 102222517. The next prime is 102222541. The reversal of 102222521 is 125222201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 99281296 + 2941225 = 9964^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 102222521 - 2² = 102222517 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 102222521.

It is not an unprimeable number, because it can be changed into a prime (102222541) 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, 198620 + ... + 199133.

It is an arithmetic number, because the mean of its divisors is an integer number (25655133).

Almost surely, 2^102222521 is an apocalyptic number.

It is an amenable number.

102222521 is a deficient number, since it is larger than the sum of its proper divisors (398011).

102222521 is an equidigital number, since it uses as much as digits as its factorization.

102222521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398010.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 102222521 is about 10110.5153676754. The cubic root of 102222521 is about 467.5723944434.

Adding to 102222521 its reverse (125222201), we get a palindrome (227444722).

The spelling of 102222521 in words is "one hundred two million, two hundred twenty-two thousand, five hundred twenty-one".