2121020025 has 12 divisors (see below), whose sum is σ = 3506753232. Its totient is φ = 1131210640.

The previous prime is 2121019997. The next prime is 2121020039. The reversal of 2121020025 is 5200201212.

It is not a de Polignac number, because 2121020025 - 2⁵ = 2121019993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2121019986 and 2121020013.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14140059 + ... + 14140208.

It is an arithmetic number, because the mean of its divisors is an integer number (292229436).

Almost surely, 2^2121020025 is an apocalyptic number.

2121020025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121020025 is a deficient number, since it is larger than the sum of its proper divisors (1385733207).

2121020025 is a wasteful number, since it uses less digits than its factorization.

2121020025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28280280 (or 28280275 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 2121020025 is about 46054.5331644997. The cubic root of 2121020025 is about 1284.8376555594.

Adding to 2121020025 its reverse (5200201212), we get a palindrome (7321221237).

The spelling of 2121020025 in words is "two billion, one hundred twenty-one million, twenty thousand, twenty-five".