25221346 has 16 divisors (see below), whose sum is σ = 39442176. Its totient is φ = 12084336.

The previous prime is 25221337. The next prime is 25221347. The reversal of 25221346 is 64312252.

It is a super-2 number, since 2×25221346² = 1272232588103432, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25221346.

It is not an unprimeable number, because it can be changed into a prime (25221347) 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, 2415 + ... + 7501.

It is an arithmetic number, because the mean of its divisors is an integer number (2465136).

Almost surely, 2^25221346 is an apocalyptic number.

25221346 is a deficient number, since it is larger than the sum of its proper divisors (14220830).

25221346 is a wasteful number, since it uses less digits than its factorization.

25221346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5193.

The product of its digits is 2880, while the sum is 25.

The square root of 25221346 is about 5022.0858216482. The cubic root of 25221346 is about 293.2621989471.

Adding to 25221346 its reverse (64312252), we get a palindrome (89533598).

The spelling of 25221346 in words is "twenty-five million, two hundred twenty-one thousand, three hundred forty-six".