21170451433 has 4 divisors (see below), whose sum is σ = 21171259648. Its totient is φ = 21169643220.

The previous prime is 21170451427. The next prime is 21170451461. The reversal of 21170451433 is 33415407112.

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 a de Polignac number, because none of the positive numbers 2^k-21170451433 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21170451395 and 21170451404.

It is not an unprimeable number, because it can be changed into a prime (21170251433) 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, 363453 + ... + 417658.

It is an arithmetic number, because the mean of its divisors is an integer number (5292814912).

Almost surely, 2^21170451433 is an apocalyptic number.

It is an amenable number.

21170451433 is a deficient number, since it is larger than the sum of its proper divisors (808215).

21170451433 is an equidigital number, since it uses as much as digits as its factorization.

21170451433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808214.

The product of its (nonzero) digits is 10080, while the sum is 31.

Adding to 21170451433 its reverse (33415407112), we get a palindrome (54585858545).

The spelling of 21170451433 in words is "twenty-one billion, one hundred seventy million, four hundred fifty-one thousand, four hundred thirty-three".