25221340 has 24 divisors (see below), whose sum is σ = 55268640. Its totient is φ = 9649728.

The previous prime is 25221337. The next prime is 25221347. The reversal of 25221340 is 4312252.

It is a super-2 number, since 2×25221340² = 1272231982791200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25221347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26955 + ... + 27874.

It is an arithmetic number, because the mean of its divisors is an integer number (2302860).

Almost surely, 2^25221340 is an apocalyptic number.

25221340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25221340 is an abundant number, since it is smaller than the sum of its proper divisors (30047300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25221340 is a wasteful number, since it uses less digits than its factorization.

25221340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54861 (or 54859 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 25221340 is about 5022.0852242868. The cubic root of 25221340 is about 293.2621756920.

Adding to 25221340 its reverse (4312252), we get a palindrome (29533592).

The spelling of 25221340 in words is "twenty-five million, two hundred twenty-one thousand, three hundred forty".