102521109 has 4 divisors (see below), whose sum is σ = 136694816. Its totient is φ = 68347404.

The previous prime is 102521077. The next prime is 102521113. The reversal of 102521109 is 901125201.

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.

It is not a de Polignac number, because 102521109 - 2⁵ = 102521077 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 (102521179) 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, 17086849 + ... + 17086854.

It is an arithmetic number, because the mean of its divisors is an integer number (34173704).

Almost surely, 2^102521109 is an apocalyptic number.

It is an amenable number.

102521109 is a deficient number, since it is larger than the sum of its proper divisors (34173707).

102521109 is an equidigital number, since it uses as much as digits as its factorization.

102521109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34173706.

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 102521109 is about 10125.2708111932. The cubic root of 102521109 is about 468.0272054825.

The spelling of 102521109 in words is "one hundred two million, five hundred twenty-one thousand, one hundred nine".