25022421 has 12 divisors (see below), whose sum is σ = 36202348. Its totient is φ = 16654464.

The previous prime is 25022407. The next prime is 25022443. The reversal of 25022421 is 12422052.

It can be written as a sum of positive squares in 2 ways, for example, as 16112196 + 8910225 = 4014^2 + 2985^2 .

It is not a de Polignac number, because 25022421 - 2¹⁰ = 25021397 is a prime.

It is a super-2 number, since 2×25022421² = 1252243105402482, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 25022394 and 25022403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25022401) 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, 4701 + ... + 8493.

Almost surely, 2^25022421 is an apocalyptic number.

It is an amenable number.

25022421 is a deficient number, since it is larger than the sum of its proper divisors (11179927).

25022421 is a wasteful number, since it uses less digits than its factorization.

25022421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4532 (or 4529 counting only the distinct ones).

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

The square root of 25022421 is about 5002.2415975241. The cubic root of 25022421 is about 292.4891602382.

Adding to 25022421 its reverse (12422052), we get a palindrome (37444473).

The spelling of 25022421 in words is "twenty-five million, twenty-two thousand, four hundred twenty-one".