21375852 has 12 divisors (see below), whose sum is σ = 49877016. Its totient is φ = 7125280.

The previous prime is 21375847. The next prime is 21375853. The reversal of 21375852 is 25857312.

It is a tau number, because it is divible by the number of its divisors (12).

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 3 ways as a sum of consecutive naturals, for example, 890649 + ... + 890672.

It is an arithmetic number, because the mean of its divisors is an integer number (4156418).

Almost surely, 2^21375852 is an apocalyptic number.

It is an amenable number.

21375852 is an abundant number, since it is smaller than the sum of its proper divisors (28501164).

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

21375852 is a wasteful number, since it uses less digits than its factorization.

21375852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1781328 (or 1781326 counting only the distinct ones).

The product of its digits is 16800, while the sum is 33.

The square root of 21375852 is about 4623.4026430758. The cubic root of 21375852 is about 277.5286424457.

The spelling of 21375852 in words is "twenty-one million, three hundred seventy-five thousand, eight hundred fifty-two".