25200421 has 2 divisors, whose sum is σ = 25200422. Its totient is φ = 25200420.

The previous prime is 25200407. The next prime is 25200431. The reversal of 25200421 is 12400252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 12348196 = 3585^2 + 3514^2 .

It is a cyclic number.

It is not a de Polignac number, because 25200421 - 2⁵ = 25200389 is a prime.

It is a super-2 number, since 2×25200421² = 1270122437154482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 25200395 and 25200404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25200431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12600210 + 12600211.

It is an arithmetic number, because the mean of its divisors is an integer number (12600211).

Almost surely, 2^25200421 is an apocalyptic number.

It is an amenable number.

25200421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25200421 is an equidigital number, since it uses as much as digits as its factorization.

25200421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 25200421 is about 5020.0020916330. The cubic root of 25200421 is about 293.1810744193.

Adding to 25200421 its reverse (12400252), we get a palindrome (37600673).

The spelling of 25200421 in words is "twenty-five million, two hundred thousand, four hundred twenty-one".