21158283 has 8 divisors (see below), whose sum is σ = 28254096. Its totient is φ = 14084000.

The previous prime is 21158273. The next prime is 21158299. The reversal of 21158283 is 38285112.

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 21158283 - 2¹² = 21154187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21158283.

It is not an unprimeable number, because it can be changed into a prime (21158273) 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, 2928 + ... + 7133.

It is an arithmetic number, because the mean of its divisors is an integer number (3531762).

Almost surely, 2^21158283 is an apocalyptic number.

21158283 is a deficient number, since it is larger than the sum of its proper divisors (7095813).

21158283 is a wasteful number, since it uses less digits than its factorization.

21158283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765.

The product of its digits is 3840, while the sum is 30.

The square root of 21158283 is about 4599.8133657791. The cubic root of 21158283 is about 276.5838433718.

The spelling of 21158283 in words is "twenty-one million, one hundred fifty-eight thousand, two hundred eighty-three".