21051552433 has 8 divisors (see below), whose sum is σ = 21304320840. Its totient is φ = 20799144960.

The previous prime is 21051552419. The next prime is 21051552439. The reversal of 21051552433 is 33425515012.

It can be written as a sum of positive squares in 4 ways, for example, as 2037348769 + 19014203664 = 45137^2 + 137892^2 .

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 21051552433 - 2¹⁷ = 21051421361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21051552395 and 21051552404.

It is not an unprimeable number, because it can be changed into a prime (21051552439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28041 + ... + 207097.

It is an arithmetic number, because the mean of its divisors is an integer number (2663040105).

Almost surely, 2^21051552433 is an apocalyptic number.

It is an amenable number.

21051552433 is a deficient number, since it is larger than the sum of its proper divisors (252768407).

21051552433 is a wasteful number, since it uses less digits than its factorization.

21051552433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180467.

The product of its (nonzero) digits is 18000, while the sum is 31.

The spelling of 21051552433 in words is "twenty-one billion, fifty-one million, five hundred fifty-two thousand, four hundred thirty-three".