2121282125 has 8 divisors (see below), whose sum is σ = 2647360248. Its totient is φ = 1697025600.

The previous prime is 2121282103. The next prime is 2121282131. The reversal of 2121282125 is 5212821212.

It can be written as a sum of positive squares in 4 ways, for example, as 56761156 + 2064520969 = 7534^2 + 45437^2 .

It is not a de Polignac number, because 2121282125 - 2²² = 2117087821 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2121282094 and 2121282103.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8485004 + ... + 8485253.

It is an arithmetic number, because the mean of its divisors is an integer number (330920031).

Almost surely, 2^2121282125 is an apocalyptic number.

2121282125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121282125 is a deficient number, since it is larger than the sum of its proper divisors (526078123).

2121282125 is an equidigital number, since it uses as much as digits as its factorization.

2121282125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16970272 (or 16970262 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 2121282125 is about 46057.3786162435. The cubic root of 2121282125 is about 1284.8905769643.

The spelling of 2121282125 in words is "two billion, one hundred twenty-one million, two hundred eighty-two thousand, one hundred twenty-five".