2121850525 has 18 divisors (see below), whose sum is σ = 2643231182. Its totient is φ = 1689676800.

The previous prime is 2121850499. The next prime is 2121850531. The reversal of 2121850525 is 5250581212.

2121850525 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 9 ways, for example, as 1051121241 + 1070729284 = 32421^2 + 32722^2 .

It is not a de Polignac number, because 2121850525 - 2¹⁹ = 2121326237 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4725501 + ... + 4725949.

Almost surely, 2^2121850525 is an apocalyptic number.

2121850525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2121850525 is a deficient number, since it is larger than the sum of its proper divisors (521380657).

2121850525 is an frugal number, since it uses more digits than its factorization.

2121850525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1329 (or 875 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 31.

The square root of 2121850525 is about 46063.5487668938. The cubic root of 2121850525 is about 1285.0053293546.

The spelling of 2121850525 in words is "two billion, one hundred twenty-one million, eight hundred fifty thousand, five hundred twenty-five".