21356852 has 12 divisors (see below), whose sum is σ = 40772256. Its totient is φ = 9707640.

The previous prime is 21356851. The next prime is 21356873. The reversal of 21356852 is 25865312.

It is a super-2 number, since 2×21356852² = 912230254699808, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21356851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 242648 + ... + 242735.

It is an arithmetic number, because the mean of its divisors is an integer number (3397688).

Almost surely, 2^21356852 is an apocalyptic number.

21356852 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21356852 is a deficient number, since it is larger than the sum of its proper divisors (19415404).

21356852 is a wasteful number, since it uses less digits than its factorization.

21356852 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485398 (or 485396 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 21356852 is about 4621.3474225598. The cubic root of 21356852 is about 277.4463906396.

The spelling of 21356852 in words is "twenty-one million, three hundred fifty-six thousand, eight hundred fifty-two".