2521001 has 6 divisors (see below), whose sum is σ = 2932650. Its totient is φ = 2160816.

The previous prime is 2520983. The next prime is 2521003. The reversal of 2521001 is 1001252.

It can be written as a sum of positive squares in only one way, i.e., 1960000 + 561001 = 1400^2 + 749^2 .

It is not a de Polignac number, because 2521001 - 2¹⁰ = 2519977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2521003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25676 + ... + 25773.

It is an arithmetic number, because the mean of its divisors is an integer number (488775).

2^2521001 is an apocalyptic number.

It is an amenable number.

2521001 is a deficient number, since it is larger than the sum of its proper divisors (411649).

2521001 is an equidigital number, since it uses as much as digits as its factorization.

2521001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51463 (or 51456 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 11.

The square root of 2521001 is about 1587.7660407000. The cubic root of 2521001 is about 136.0998581778.

Adding to 2521001 its reverse (1001252), we get a palindrome (3522253).

It can be divided in two parts, 252 and 1001, that multiplied together give a palindrome (252252).

The spelling of 2521001 in words is "two million, five hundred twenty-one thousand, one".