21231431033 has 8 divisors (see below), whose sum is σ = 21526884456. Its totient is φ = 20936102400.

The previous prime is 21231431029. The next prime is 21231431069. The reversal of 21231431033 is 33013413212.

It can be written as a sum of positive squares in 4 ways, for example, as 93760489 + 21137670544 = 9683^2 + 145388^2 .

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 21231431033 - 2² = 21231431029 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21231431093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342293 + ... + 399533.

It is an arithmetic number, because the mean of its divisors is an integer number (2690860557).

Almost surely, 2^21231431033 is an apocalyptic number.

It is an amenable number.

21231431033 is a deficient number, since it is larger than the sum of its proper divisors (295453423).

21231431033 is an equidigital number, since it uses as much as digits as its factorization.

21231431033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62395.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21231431033 its reverse (33013413212), we get a palindrome (54244844245).

The spelling of 21231431033 in words is "twenty-one billion, two hundred thirty-one million, four hundred thirty-one thousand, thirty-three".