21283013 has 8 divisors (see below), whose sum is σ = 22222200. Its totient is φ = 20357568.

The previous prime is 21283001. The next prime is 21283033. The reversal of 21283013 is 31038212.

It can be written as a sum of positive squares in 4 ways, for example, as 12271009 + 9012004 = 3503^2 + 3002^2 .

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 21283013 - 2¹⁰ = 21281989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283033) 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, 206 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (2777775).

Almost surely, 2^21283013 is an apocalyptic number.

It is an amenable number.

21283013 is a deficient number, since it is larger than the sum of its proper divisors (939187).

21283013 is a wasteful number, since it uses less digits than its factorization.

21283013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 21283013 is about 4613.3516016016. The cubic root of 21283013 is about 277.1262744963.

The spelling of 21283013 in words is "twenty-one million, two hundred eighty-three thousand, thirteen".