25200206021 has 4 divisors (see below), whose sum is σ = 25291181772. Its totient is φ = 25109230272.

The previous prime is 25200205907. The next prime is 25200206039. The reversal of 25200206021 is 12060200252.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2679201121 + 22521004900 = 51761^2 + 150070^2 .

It is a cyclic number.

It is not a de Polignac number, because 25200206021 - 2³⁴ = 8020336837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25200205984 and 25200206002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25200206041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45487460 + ... + 45488013.

It is an arithmetic number, because the mean of its divisors is an integer number (6322795443).

Almost surely, 2^25200206021 is an apocalyptic number.

It is an amenable number.

25200206021 is a deficient number, since it is larger than the sum of its proper divisors (90975751).

25200206021 is an equidigital number, since it uses as much as digits as its factorization.

25200206021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90975750.

The product of its (nonzero) digits is 480, while the sum is 20.

Adding to 25200206021 its reverse (12060200252), we get a palindrome (37260406273).

The spelling of 25200206021 in words is "twenty-five billion, two hundred million, two hundred six thousand, twenty-one".