21207883 has 4 divisors (see below), whose sum is σ = 21221928. Its totient is φ = 21193840.

The previous prime is 21207881. The next prime is 21207997. The reversal of 21207883 is 38870212.

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

It is a cyclic number.

It is not a de Polignac number, because 21207883 - 2¹ = 21207881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21207881) 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 3 ways as a sum of consecutive naturals, for example, 4441 + ... + 7882.

It is an arithmetic number, because the mean of its divisors is an integer number (5305482).

Almost surely, 2^21207883 is an apocalyptic number.

21207883 is a deficient number, since it is larger than the sum of its proper divisors (14045).

21207883 is a wasteful number, since it uses less digits than its factorization.

21207883 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14044.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 21207883 is about 4605.2017328234. The cubic root of 21207883 is about 276.7998006043.

The spelling of 21207883 in words is "twenty-one million, two hundred seven thousand, eight hundred eighty-three".