2501500021 has 4 divisors (see below), whose sum is σ = 2501604000. Its totient is φ = 2501396044.

The previous prime is 2501499971. The next prime is 2501500051. The reversal of 2501500021 is 1200051052.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2501500021 - 2¹⁵ = 2501467253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2501499968 and 2501500004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501500051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4710 + ... + 70888.

It is an arithmetic number, because the mean of its divisors is an integer number (625401000).

Almost surely, 2^2501500021 is an apocalyptic number.

It is an amenable number.

2501500021 is a deficient number, since it is larger than the sum of its proper divisors (103979).

2501500021 is an equidigital number, since it uses as much as digits as its factorization.

2501500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103978.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 2501500021 is about 50014.9979606118. The cubic root of 2501500021 is about 1357.4801995875.

Adding to 2501500021 its reverse (1200051052), we get a palindrome (3701551073).

The spelling of 2501500021 in words is "two billion, five hundred one million, five hundred thousand, twenty-one".