21343827 has 8 divisors (see below), whose sum is σ = 28486080. Its totient is φ = 14215400.

The previous prime is 21343801. The next prime is 21343831. The reversal of 21343827 is 72834312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21343827 - 2¹¹ = 21341779 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21343794 and 21343803.

It is not an unprimeable number, because it can be changed into a prime (21347827) 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 in 7 ways as a sum of consecutive naturals, for example, 952 + ... + 6602.

It is an arithmetic number, because the mean of its divisors is an integer number (3560760).

Almost surely, 2^21343827 is an apocalyptic number.

21343827 is a deficient number, since it is larger than the sum of its proper divisors (7142253).

21343827 is a wasteful number, since it uses less digits than its factorization.

21343827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6913.

The product of its digits is 8064, while the sum is 30.

The square root of 21343827 is about 4619.9379865968. The cubic root of 21343827 is about 277.3899766742.

The spelling of 21343827 in words is "twenty-one million, three hundred forty-three thousand, eight hundred twenty-seven".