21375850 has 12 divisors (see below), whose sum is σ = 39759174. Its totient is φ = 8550320.

The previous prime is 21375847. The next prime is 21375853. The reversal of 21375850 is 5857312.

It is an interprime number because it is at equal distance from previous prime (21375847) and next prime (21375853).

It can be written as a sum of positive squares in 3 ways, for example, as 19545241 + 1830609 = 4421^2 + 1353^2 .

It is not an unprimeable number, because it can be changed into a prime (21375853) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213709 + ... + 213808.

Almost surely, 2^21375850 is an apocalyptic number.

21375850 is a deficient number, since it is larger than the sum of its proper divisors (18383324).

21375850 is a wasteful number, since it uses less digits than its factorization.

21375850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427529 (or 427524 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 21375850 is about 4623.4024267848. The cubic root of 21375850 is about 277.5286337902.

The spelling of 21375850 in words is "twenty-one million, three hundred seventy-five thousand, eight hundred fifty".