21875258 has 8 divisors (see below), whose sum is σ = 33228480. Its totient is φ = 10799100.

The previous prime is 21875237. The next prime is 21875279. The reversal of 21875258 is 85257812.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21875237) and next prime (21875279).

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 69068 + ... + 69383.

It is an arithmetic number, because the mean of its divisors is an integer number (4153560).

Almost surely, 2^21875258 is an apocalyptic number.

21875258 is a deficient number, since it is larger than the sum of its proper divisors (11353222).

21875258 is a wasteful number, since it uses less digits than its factorization.

21875258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138532.

The product of its digits is 44800, while the sum is 38.

The square root of 21875258 is about 4677.0993147463. The cubic root of 21875258 is about 279.6733350274.

The spelling of 21875258 in words is "twenty-one million, eight hundred seventy-five thousand, two hundred fifty-eight".