21231083 has 4 divisors (see below), whose sum is σ = 21324840. Its totient is φ = 21137328.

The previous prime is 21231029. The next prime is 21231107. The reversal of 21231083 is 38013212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21231083 - 2⁸ = 21230827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46538 + ... + 46991.

It is an arithmetic number, because the mean of its divisors is an integer number (5331210).

Almost surely, 2^21231083 is an apocalyptic number.

21231083 is a deficient number, since it is larger than the sum of its proper divisors (93757).

21231083 is an equidigital number, since it uses as much as digits as its factorization.

21231083 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93756.

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

The square root of 21231083 is about 4607.7199350655. The cubic root of 21231083 is about 276.9006972873.

Adding to 21231083 its reverse (38013212), we get a palindrome (59244295).

The spelling of 21231083 in words is "twenty-one million, two hundred thirty-one thousand, eighty-three".