25454021 has 2 divisors, whose sum is σ = 25454022. Its totient is φ = 25454020.

The previous prime is 25454017. The next prime is 25454057. The reversal of 25454021 is 12045452.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25391521 + 62500 = 5039^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 25454021 - 2² = 25454017 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25454521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12727010 + 12727011.

It is an arithmetic number, because the mean of its divisors is an integer number (12727011).

Almost surely, 2^25454021 is an apocalyptic number.

It is an amenable number.

25454021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25454021 is an equidigital number, since it uses as much as digits as its factorization.

25454021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 25454021 is about 5045.1978157452. The cubic root of 25454021 is about 294.1612524940.

Adding to 25454021 its reverse (12045452), we get a palindrome (37499473).

The spelling of 25454021 in words is "twenty-five million, four hundred fifty-four thousand, twenty-one".