21355846 has 4 divisors (see below), whose sum is σ = 32033772. Its totient is φ = 10677922.

The previous prime is 21355843. The next prime is 21355849. The reversal of 21355846 is 64855312.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (21355843) and next prime (21355849).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21355843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5338960 + ... + 5338963.

It is an arithmetic number, because the mean of its divisors is an integer number (8008443).

Almost surely, 2^21355846 is an apocalyptic number.

21355846 is a deficient number, since it is larger than the sum of its proper divisors (10677926).

21355846 is a wasteful number, since it uses less digits than its factorization.

21355846 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677925.

The product of its digits is 28800, while the sum is 34.

The square root of 21355846 is about 4621.2385785631. The cubic root of 21355846 is about 277.4420342633.

It can be divided in two parts, 21355 and 846, that added together give a square (22201 = 149²).

The spelling of 21355846 in words is "twenty-one million, three hundred fifty-five thousand, eight hundred forty-six".