20330021231 has 4 divisors (see below), whose sum is σ = 21893869032. Its totient is φ = 18766173432.

The previous prime is 20330021171. The next prime is 20330021269. The reversal of 20330021231 is 13212003302.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20330021231 is a prime.

It is a super-2 number, since 2×20330021231² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20330021281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 781923881 + ... + 781923906.

It is an arithmetic number, because the mean of its divisors is an integer number (5473467258).

Almost surely, 2^20330021231 is an apocalyptic number.

20330021231 is a deficient number, since it is larger than the sum of its proper divisors (1563847801).

20330021231 is a wasteful number, since it uses less digits than its factorization.

20330021231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1563847800.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 20330021231 its reverse (13212003302), we get a palindrome (33542024533).

The spelling of 20330021231 in words is "twenty billion, three hundred thirty million, twenty-one thousand, two hundred thirty-one".