102521001 has 12 divisors (see below), whose sum is σ = 150251696. Its totient is φ = 62133720.

The previous prime is 102520991. The next prime is 102521039. The reversal of 102521001 is 100125201.

It is not a de Polignac number, because 102521001 - 2¹⁸ = 102258857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102521071) 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, 140851 + ... + 141576.

Almost surely, 2^102521001 is an apocalyptic number.

102521001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

102521001 is a deficient number, since it is larger than the sum of its proper divisors (47730695).

102521001 is a wasteful number, since it uses less digits than its factorization.

102521001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282452 (or 282441 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 12.

The square root of 102521001 is about 10125.2654780011. The cubic root of 102521001 is about 468.0270411360.

Adding to 102521001 its reverse (100125201), we get a palindrome (202646202).

The spelling of 102521001 in words is "one hundred two million, five hundred twenty-one thousand, one".