25221161 has 8 divisors (see below), whose sum is σ = 29603520. Its totient is φ = 21033648.

The previous prime is 25221137. The next prime is 25221173. The reversal of 25221161 is 16112252.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 25221161 - 2¹⁸ = 24959017 is a prime.

It is a super-2 number, since 2×25221161² = 1272213924375842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25221181) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48431 + ... + 48948.

It is an arithmetic number, because the mean of its divisors is an integer number (3700440).

Almost surely, 2^25221161 is an apocalyptic number.

It is an amenable number.

25221161 is a deficient number, since it is larger than the sum of its proper divisors (4382359).

25221161 is an equidigital number, since it uses as much as digits as its factorization.

25221161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97423.

The product of its digits is 240, while the sum is 20.

The square root of 25221161 is about 5022.0674029726. The cubic root of 25221161 is about 293.2614819137.

The spelling of 25221161 in words is "twenty-five million, two hundred twenty-one thousand, one hundred sixty-one".