21371283 has 10 divisors (see below), whose sum is σ = 31925124. Its totient is φ = 14247468.

The previous prime is 21371281. The next prime is 21371293. The reversal of 21371283 is 38217312.

It is not a de Polignac number, because 21371283 - 2¹ = 21371281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21371281) 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 9 ways as a sum of consecutive naturals, for example, 131841 + ... + 132002.

Almost surely, 2^21371283 is an apocalyptic number.

21371283 is a deficient number, since it is larger than the sum of its proper divisors (10553841).

21371283 is an equidigital number, since it uses as much as digits as its factorization.

21371283 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263855 (or 263846 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 21371283 is about 4622.9085000679. The cubic root of 21371283 is about 277.5088675033.

Adding to 21371283 its reverse (38217312), we get a palindrome (59588595).

The spelling of 21371283 in words is "twenty-one million, three hundred seventy-one thousand, two hundred eighty-three".