21267283 has 8 divisors (see below), whose sum is σ = 21514752. Its totient is φ = 21021576.

The previous prime is 21267263. The next prime is 21267371. The reversal of 21267283 is 38276212.

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 21267283 - 2⁹ = 21266771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21267263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57766 + ... + 58132.

It is an arithmetic number, because the mean of its divisors is an integer number (2689344).

Almost surely, 2^21267283 is an apocalyptic number.

21267283 is a deficient number, since it is larger than the sum of its proper divisors (247469).

21267283 is a wasteful number, since it uses less digits than its factorization.

21267283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 881.

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

The square root of 21267283 is about 4611.6464521904. The cubic root of 21267283 is about 277.0579841861.

It can be divided in two parts, 2126 and 7283, that added together give a square (9409 = 97²).

The spelling of 21267283 in words is "twenty-one million, two hundred sixty-seven thousand, two hundred eighty-three".