2121501025 has 24 divisors (see below), whose sum is σ = 3137192064. Its totient is φ = 1391491200.

The previous prime is 2121501023. The next prime is 2121501037. The reversal of 2121501025 is 5201051212.

It is not a de Polignac number, because 2121501025 - 2¹ = 2121501023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121500993 and 2121501011.

It is not an unprimeable number, because it can be changed into a prime (2121501023) 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 23 ways as a sum of consecutive naturals, for example, 259516 + ... + 267565.

It is an arithmetic number, because the mean of its divisors is an integer number (130716336).

Almost surely, 2^2121501025 is an apocalyptic number.

2121501025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121501025 is a deficient number, since it is larger than the sum of its proper divisors (1015691039).

2121501025 is a wasteful number, since it uses less digits than its factorization.

2121501025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527121 (or 527116 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 19.

The square root of 2121501025 is about 46059.7549385578. The cubic root of 2121501025 is about 1284.9347723859.

Adding to 2121501025 its reverse (5201051212), we get a palindrome (7322552237).

The spelling of 2121501025 in words is "two billion, one hundred twenty-one million, five hundred one thousand, twenty-five".