25020421 has 2 divisors, whose sum is σ = 25020422. Its totient is φ = 25020420.

The previous prime is 25020409. The next prime is 25020461. The reversal of 25020421 is 12402052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24117921 + 902500 = 4911^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 25020421 - 2⁹ = 25019909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 25020395 and 25020404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25020461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12510210 + 12510211.

It is an arithmetic number, because the mean of its divisors is an integer number (12510211).

Almost surely, 2^25020421 is an apocalyptic number.

It is an amenable number.

25020421 is a deficient number, since it is larger than the sum of its proper divisors (1).

25020421 is an equidigital number, since it uses as much as digits as its factorization.

25020421 is an evil number, because the sum of its binary digits is even.

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

The square root of 25020421 is about 5002.0416831530. The cubic root of 25020421 is about 292.4813673085.

Adding to 25020421 its reverse (12402052), we get a palindrome (37422473).

The spelling of 25020421 in words is "twenty-five million, twenty thousand, four hundred twenty-one".