21231320411 has 4 divisors (see below), whose sum is σ = 24264366192. Its totient is φ = 18198274632.

The previous prime is 21231320381. The next prime is 21231320441. The reversal of 21231320411 is 11402313212.

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

It is an interprime number because it is at equal distance from previous prime (21231320381) and next prime (21231320441).

It is a cyclic number.

It is not a de Polignac number, because 21231320411 - 2¹⁴ = 21231304027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231320441) 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, 1516522880 + ... + 1516522893.

It is an arithmetic number, because the mean of its divisors is an integer number (6066091548).

Almost surely, 2^21231320411 is an apocalyptic number.

21231320411 is a deficient number, since it is larger than the sum of its proper divisors (3033045781).

21231320411 is an equidigital number, since it uses as much as digits as its factorization.

21231320411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3033045780.

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

Adding to 21231320411 its reverse (11402313212), we get a palindrome (32633633623).

The spelling of 21231320411 in words is "twenty-one billion, two hundred thirty-one million, three hundred twenty thousand, four hundred eleven".