21875425 has 48 divisors (see below), whose sum is σ = 33122880. Its totient is φ = 14112000.

The previous prime is 21875423. The next prime is 21875437. The reversal of 21875425 is 52457812.

It is a happy number.

It is not a de Polignac number, because 21875425 - 2¹ = 21875423 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21875423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 103570 + ... + 103780.

It is an arithmetic number, because the mean of its divisors is an integer number (690060).

Almost surely, 2^21875425 is an apocalyptic number.

21875425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21875425 is a deficient number, since it is larger than the sum of its proper divisors (11247455).

21875425 is a wasteful number, since it uses less digits than its factorization.

21875425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 269 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 21875425 is about 4677.1171676579. The cubic root of 21875425 is about 279.6740467193.

The spelling of 21875425 in words is "twenty-one million, eight hundred seventy-five thousand, four hundred twenty-five".