21455555431033 has 4 divisors (see below), whose sum is σ = 21493664766288. Its totient is φ = 21417446095780.

The previous prime is 21455555431007. The next prime is 21455555431067. The reversal of 21455555431033 is 33013455555412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21455555431033 - 2²¹ = 21455553333881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21455558431033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19054666783 + ... + 19054667908.

It is an arithmetic number, because the mean of its divisors is an integer number (5373416191572).

Almost surely, 2^{21455555431033} is an apocalyptic number.

It is an amenable number.

21455555431033 is a deficient number, since it is larger than the sum of its proper divisors (38109335255).

21455555431033 is an equidigital number, since it uses as much as digits as its factorization.

21455555431033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38109335254.

The product of its (nonzero) digits is 2700000, while the sum is 46.

The spelling of 21455555431033 in words is "twenty-one trillion, four hundred fifty-five billion, five hundred fifty-five million, four hundred thirty-one thousand, thirty-three".