21283627 has 4 divisors (see below), whose sum is σ = 21553120. Its totient is φ = 21014136.

The previous prime is 21283597. The next prime is 21283657. The reversal of 21283627 is 72638212.

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 (21283597) and next prime (21283657).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21283627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21283657) 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, 134628 + ... + 134785.

It is an arithmetic number, because the mean of its divisors is an integer number (5388280).

Almost surely, 2^21283627 is an apocalyptic number.

21283627 is a deficient number, since it is larger than the sum of its proper divisors (269493).

21283627 is an equidigital number, since it uses as much as digits as its factorization.

21283627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269492.

The product of its digits is 8064, while the sum is 31.

The square root of 21283627 is about 4613.4181471009. The cubic root of 21283627 is about 277.1289394369.

The spelling of 21283627 in words is "twenty-one million, two hundred eighty-three thousand, six hundred twenty-seven".