21516361050433 has 4 divisors (see below), whose sum is σ = 22041150344388. Its totient is φ = 20991571756480.

The previous prime is 21516361050409. The next prime is 21516361050517. The reversal of 21516361050433 is 33405016361512.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3331526611009 + 18184834439424 = 1825247^2 + 4264368^2 .

It is a cyclic number.

It is not a de Polignac number, because 21516361050433 - 2²¹ = 21516358953281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21516361050133) 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, 262394646916 + ... + 262394646997.

It is an arithmetic number, because the mean of its divisors is an integer number (5510287586097).

Almost surely, 2^{21516361050433} is an apocalyptic number.

It is an amenable number.

21516361050433 is a deficient number, since it is larger than the sum of its proper divisors (524789293955).

21516361050433 is an equidigital number, since it uses as much as digits as its factorization.

21516361050433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524789293954.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 21516361050433 in words is "twenty-one trillion, five hundred sixteen billion, three hundred sixty-one million, fifty thousand, four hundred thirty-three".