21854425 has 12 divisors (see below), whose sum is σ = 27225936. Its totient is φ = 17402000.

The previous prime is 21854423. The next prime is 21854431. The reversal of 21854425 is 52445812.

It is not a de Polignac number, because 21854425 - 2¹ = 21854423 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21854423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3750 + ... + 7600.

It is an arithmetic number, because the mean of its divisors is an integer number (2268828).

Almost surely, 2^21854425 is an apocalyptic number.

21854425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21854425 is a deficient number, since it is larger than the sum of its proper divisors (5371511).

21854425 is a wasteful number, since it uses less digits than its factorization.

21854425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088 (or 4083 counting only the distinct ones).

The product of its digits is 12800, while the sum is 31.

The square root of 21854425 is about 4674.8716559923. The cubic root of 21854425 is about 279.5845241103.

The spelling of 21854425 in words is "twenty-one million, eight hundred fifty-four thousand, four hundred twenty-five".