25162021 has 2 divisors, whose sum is σ = 25162022. Its totient is φ = 25162020.

The previous prime is 25162019. The next prime is 25162037. The reversal of 25162021 is 12026152.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19936225 + 5225796 = 4465^2 + 2286^2 .

It is a cyclic number.

It is not a de Polignac number, because 25162021 - 2¹ = 25162019 is a prime.

Together with 25162019, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 25162021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (25162001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12581010 + 12581011.

It is an arithmetic number, because the mean of its divisors is an integer number (12581011).

Almost surely, 2^25162021 is an apocalyptic number.

It is an amenable number.

25162021 is a deficient number, since it is larger than the sum of its proper divisors (1).

25162021 is an equidigital number, since it uses as much as digits as its factorization.

25162021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 25162021 is about 5016.1759339162. The cubic root of 25162021 is about 293.0320838338.

Adding to 25162021 its reverse (12026152), we get a palindrome (37188173).

The spelling of 25162021 in words is "twenty-five million, one hundred sixty-two thousand, twenty-one".