25421000 has 64 divisors (see below), whose sum is σ = 64920960. Its totient is φ = 9240000.

The previous prime is 25420979. The next prime is 25421021. The reversal of 25421000 is 12452.

It is an interprime number because it is at equal distance from previous prime (25420979) and next prime (25421021).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 9845 + ... + 12155.

It is an arithmetic number, because the mean of its divisors is an integer number (1014390).

Almost surely, 2^25421000 is an apocalyptic number.

25421000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25421000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32460480).

25421000 is an abundant number, since it is smaller than the sum of its proper divisors (39499960).

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

25421000 is a wasteful number, since it uses less digits than its factorization.

25421000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2343 (or 2329 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 25421000 is about 5041.9242358449. The cubic root of 25421000 is about 294.0339942490.

Adding to 25421000 its reverse (12452), we get a palindrome (25433452).

The spelling of 25421000 in words is "twenty-five million, four hundred twenty-one thousand".