21875259 has 16 divisors (see below), whose sum is σ = 33401088. Its totient is φ = 12474912.

The previous prime is 21875237. The next prime is 21875279. The reversal of 21875259 is 95257812.

It is not a de Polignac number, because 21875259 - 2⁷ = 21875131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21875279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16084 + ... + 17390.

It is an arithmetic number, because the mean of its divisors is an integer number (2087568).

Almost surely, 2^21875259 is an apocalyptic number.

21875259 is a deficient number, since it is larger than the sum of its proper divisors (11525829).

21875259 is a wasteful number, since it uses less digits than its factorization.

21875259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2114.

The product of its digits is 50400, while the sum is 39.

The square root of 21875259 is about 4677.0994216501. The cubic root of 21875259 is about 279.6733392891.

The spelling of 21875259 in words is "twenty-one million, eight hundred seventy-five thousand, two hundred fifty-nine".