102223521 has 12 divisors (see below), whose sum is σ = 152748180. Its totient is φ = 65798880.

The previous prime is 102223507. The next prime is 102223559. The reversal of 102223521 is 125322201.

It can be written as a sum of positive squares in 2 ways, for example, as 60233121 + 41990400 = 7761^2 + 6480^2 .

It is not a de Polignac number, because 102223521 - 2¹¹ = 102221473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 102223494 and 102223503.

It is not an unprimeable number, because it can be changed into a prime (102223621) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 195570 + ... + 196091.

It is an arithmetic number, because the mean of its divisors is an integer number (12729015).

Almost surely, 2^102223521 is an apocalyptic number.

It is an amenable number.

102223521 is a deficient number, since it is larger than the sum of its proper divisors (50524659).

102223521 is a wasteful number, since it uses less digits than its factorization.

102223521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391696 (or 391693 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 102223521 is about 10110.5648210177. The cubic root of 102223521 is about 467.5739191265.

Adding to 102223521 its reverse (125322201), we get a palindrome (227545722).

The spelling of 102223521 in words is "one hundred two million, two hundred twenty-three thousand, five hundred twenty-one".