102525221 has 4 divisors (see below), whose sum is σ = 102547200. Its totient is φ = 102503244.

The previous prime is 102525211. The next prime is 102525223. The reversal of 102525221 is 122525201.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 122525201 = 797 ⋅153733.

It is a cyclic number.

It is not a de Polignac number, because 102525221 - 2¹⁰ = 102524197 is a prime.

It is a super-2 number, since 2×102525221² = 21022841882197682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102525193 and 102525202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102525223) 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, 911 + ... + 14348.

It is an arithmetic number, because the mean of its divisors is an integer number (25636800).

Almost surely, 2^102525221 is an apocalyptic number.

It is an amenable number.

102525221 is a deficient number, since it is larger than the sum of its proper divisors (21979).

102525221 is an equidigital number, since it uses as much as digits as its factorization.

102525221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21978.

The product of its (nonzero) digits is 400, while the sum is 20.

The square root of 102525221 is about 10125.4738654544. The cubic root of 102525221 is about 468.0334627375.

Subtracting from 102525221 its sum of digits (20), we obtain a palindrome (102525201).

The spelling of 102525221 in words is "one hundred two million, five hundred twenty-five thousand, two hundred twenty-one".