25422021 has 12 divisors (see below), whose sum is σ = 38880972. Its totient is φ = 15950976.

The previous prime is 25422013. The next prime is 25422029. The reversal of 25422021 is 12022452.

It is an interprime number because it is at equal distance from previous prime (25422013) and next prime (25422029).

It can be written as a sum of positive squares in 2 ways, for example, as 17969121 + 7452900 = 4239^2 + 2730^2 .

It is not a de Polignac number, because 25422021 - 2³ = 25422013 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25421985 and 25422003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25422029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 82926 + ... + 83231.

It is an arithmetic number, because the mean of its divisors is an integer number (3240081).

Almost surely, 2^25422021 is an apocalyptic number.

It is an amenable number.

25422021 is a deficient number, since it is larger than the sum of its proper divisors (13458951).

25422021 is a wasteful number, since it uses less digits than its factorization.

25422021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166180 (or 166177 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 25422021 is about 5042.0254858539. The cubic root of 25422021 is about 294.0379306885.

Adding to 25422021 its reverse (12022452), we get a palindrome (37444473).

The spelling of 25422021 in words is "twenty-five million, four hundred twenty-two thousand, twenty-one".