21875670 has 80 divisors (see below), whose sum is σ = 59590080. Its totient is φ = 5757696.

The previous prime is 21875647. The next prime is 21875699. The reversal of 21875670 is 7657812.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 91411 + ... + 91649.

It is an arithmetic number, because the mean of its divisors is an integer number (744876).

Almost surely, 2^21875670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21875670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29795040).

21875670 is an abundant number, since it is smaller than the sum of its proper divisors (37714410).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21875670 is a wasteful number, since it uses less digits than its factorization.

21875670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371 (or 362 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 21875670 is about 4677.1433589318. The cubic root of 21875670 is about 279.6750908115.

The spelling of 21875670 in words is "twenty-one million, eight hundred seventy-five thousand, six hundred seventy".