20321223231 has 8 divisors (see below), whose sum is σ = 27755817264. Its totient is φ = 13217055680.

The previous prime is 20321223217. The next prime is 20321223257. The reversal of 20321223231 is 13232212302.

It is a happy number.

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 20321223231 - 2¹⁹ = 20320698943 is a prime.

It is a super-2 number, since 2×20321223231² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20321223198 and 20321223207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321223931) 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, 82606476 + ... + 82606721.

It is an arithmetic number, because the mean of its divisors is an integer number (3469477158).

Almost surely, 2^20321223231 is an apocalyptic number.

20321223231 is a deficient number, since it is larger than the sum of its proper divisors (7434594033).

20321223231 is a wasteful number, since it uses less digits than its factorization.

20321223231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165213241.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 20321223231 its reverse (13232212302), we get a palindrome (33553435533).

The spelling of 20321223231 in words is "twenty billion, three hundred twenty-one million, two hundred twenty-three thousand, two hundred thirty-one".