21191852 has 12 divisors (see below), whose sum is σ = 40457256. Its totient is φ = 9632640.

The previous prime is 21191831. The next prime is 21191857. The reversal of 21191852 is 25819112.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (21191857) 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, 240773 + ... + 240860.

It is an arithmetic number, because the mean of its divisors is an integer number (3371438).

Almost surely, 2^21191852 is an apocalyptic number.

21191852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21191852 is a deficient number, since it is larger than the sum of its proper divisors (19265404).

21191852 is a wasteful number, since it uses less digits than its factorization.

21191852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481648 (or 481646 counting only the distinct ones).

The product of its digits is 1440, while the sum is 29.

The square root of 21191852 is about 4603.4608719962. The cubic root of 21191852 is about 276.7300388693.

The spelling of 21191852 in words is "twenty-one million, one hundred ninety-one thousand, eight hundred fifty-two".