21331333001431 has 4 divisors (see below), whose sum is σ = 21331350513864. Its totient is φ = 21331315489000.

The previous prime is 21331333001401. The next prime is 21331333001443. The reversal of 21331333001431 is 13410033313312.

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 21331333001431 - 2¹³ = 21331332993239 is a prime.

It is a super-2 number, since 2×21331333001431² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21331333001431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331333001401) 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 3 ways as a sum of consecutive naturals, for example, 6780520 + ... + 9414781.

It is an arithmetic number, because the mean of its divisors is an integer number (5332837628466).

Almost surely, 2^{21331333001431} is an apocalyptic number.

21331333001431 is a deficient number, since it is larger than the sum of its proper divisors (17512433).

21331333001431 is a wasteful number, since it uses less digits than its factorization.

21331333001431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17512432.

The product of its (nonzero) digits is 5832, while the sum is 28.

Adding to 21331333001431 its reverse (13410033313312), we get a palindrome (34741366314743).

The spelling of 21331333001431 in words is "twenty-one trillion, three hundred thirty-one billion, three hundred thirty-three million, one thousand, four hundred thirty-one".