21321203133431 has 4 divisors (see below), whose sum is σ = 21414308824200. Its totient is φ = 21228097442664.

The previous prime is 21321203133389. The next prime is 21321203133521. The reversal of 21321203133431 is 13433130212312.

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 21321203133431 - 2¹⁰ = 21321203132407 is a prime.

It is a super-4 number, since 4×21321203133431⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321203133394 and 21321203133403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321203133331) 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, 46552845041 + ... + 46552845498.

It is an arithmetic number, because the mean of its divisors is an integer number (5353577206050).

Almost surely, 2^{21321203133431} is an apocalyptic number.

21321203133431 is a deficient number, since it is larger than the sum of its proper divisors (93105690769).

21321203133431 is an equidigital number, since it uses as much as digits as its factorization.

21321203133431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93105690768.

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 21321203133431 its reverse (13433130212312), we get a palindrome (34754333345743).

The spelling of 21321203133431 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred three million, one hundred thirty-three thousand, four hundred thirty-one".