21627425 has 24 divisors (see below), whose sum is σ = 27932736. Its totient is φ = 16597440.

The previous prime is 21627421. The next prime is 21627449. The reversal of 21627425 is 52472612.

It is a happy number.

It is not a de Polignac number, because 21627425 - 2² = 21627421 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21627421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95162 + ... + 95388.

It is an arithmetic number, because the mean of its divisors is an integer number (1163864).

Almost surely, 2^21627425 is an apocalyptic number.

21627425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21627425 is a deficient number, since it is larger than the sum of its proper divisors (6305311).

21627425 is a wasteful number, since it uses less digits than its factorization.

21627425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 372 counting only the distinct ones).

The product of its digits is 6720, while the sum is 29.

The square root of 21627425 is about 4650.5295397406. The cubic root of 21627425 is about 278.6131464399.

The spelling of 21627425 in words is "twenty-one million, six hundred twenty-seven thousand, four hundred twenty-five".