21670083 has 12 divisors (see below), whose sum is σ = 31388760. Its totient is φ = 14406336.

The previous prime is 21670079. The next prime is 21670109. The reversal of 21670083 is 38007612.

It is not a de Polignac number, because 21670083 - 2² = 21670079 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21670003) 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 11 ways as a sum of consecutive naturals, for example, 235 + ... + 6587.

It is an arithmetic number, because the mean of its divisors is an integer number (2615730).

Almost surely, 2^21670083 is an apocalyptic number.

21670083 is a deficient number, since it is larger than the sum of its proper divisors (9718677).

21670083 is a wasteful number, since it uses less digits than its factorization.

21670083 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6738 (or 6735 counting only the distinct ones).

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

The square root of 21670083 is about 4655.1136398589. The cubic root of 21670083 is about 278.7962052814.

Adding to 21670083 its reverse (38007612), we get a palindrome (59677695).

The spelling of 21670083 in words is "twenty-one million, six hundred seventy thousand, eighty-three".