21050532025 has 6 divisors (see below), whose sum is σ = 26102659742. Its totient is φ = 16840425600.

The previous prime is 21050532017. The next prime is 21050532043. The reversal of 21050532025 is 52023505012.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 7366445584 + 13684086441 = 85828^2 + 116979^2 .

It is not a de Polignac number, because 21050532025 - 2³ = 21050532017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 842021281 = 21050532025 / (2 + 1 + 0 + 5 + 0 + 5 + 3 + 2 + 0 + 2 + 5).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 421010616 + ... + 421010665.

Almost surely, 2^21050532025 is an apocalyptic number.

21050532025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21050532025 is a deficient number, since it is larger than the sum of its proper divisors (5052127717).

21050532025 is an equidigital number, since it uses as much as digits as its factorization.

21050532025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 842021291 (or 842021286 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 25.

The spelling of 21050532025 in words is "twenty-one billion, fifty million, five hundred thirty-two thousand, twenty-five".