1025210521 has 2 divisors, whose sum is σ = 1025210522. Its totient is φ = 1025210520.

The previous prime is 1025210519. The next prime is 1025210573. The reversal of 1025210521 is 1250125201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 584672400 + 440538121 = 24180^2 + 20989^2 .

It is a cyclic number.

It is not a de Polignac number, because 1025210521 - 2¹ = 1025210519 is a prime.

It is a super-2 number, since 2×1025210521² = 2102113224738182882, which contains 22 as substring.

Together with 1025210519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1025210621) 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 as a sum of consecutive naturals, namely, 512605260 + 512605261.

It is an arithmetic number, because the mean of its divisors is an integer number (512605261).

Almost surely, 2^1025210521 is an apocalyptic number.

It is an amenable number.

1025210521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1025210521 is an equidigital number, since it uses as much as digits as its factorization.

1025210521 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1025210521 is about 32018.9088040177. The cubic root of 1025210521 is about 1008.3338608259. Note that the first 3 decimals are identical.

Adding to 1025210521 its reverse (1250125201), we get a palindrome (2275335722).

The spelling of 1025210521 in words is "one billion, twenty-five million, two hundred ten thousand, five hundred twenty-one".