25221501 has 12 divisors (see below), whose sum is σ = 38015328. Its totient is φ = 16083144.

The previous prime is 25221499. The next prime is 25221529. The reversal of 25221501 is 10512252.

It is not a de Polignac number, because 25221501 - 2¹ = 25221499 is a prime.

It is a super-2 number, since 2×25221501² = 1272248225386002, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60715 + ... + 61128.

It is an arithmetic number, because the mean of its divisors is an integer number (3167944).

Almost surely, 2^25221501 is an apocalyptic number.

It is an amenable number.

25221501 is a deficient number, since it is larger than the sum of its proper divisors (12793827).

25221501 is a wasteful number, since it uses less digits than its factorization.

25221501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121872 (or 121869 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 25221501 is about 5022.1012534596. The cubic root of 25221501 is about 293.2627997021.

Adding to 25221501 its reverse (10512252), we get a palindrome (35733753).

The spelling of 25221501 in words is "twenty-five million, two hundred twenty-one thousand, five hundred one".