21633164047 has 8 divisors (see below), whose sum is σ = 23605887312. Its totient is φ = 19661452800.

The previous prime is 21633164029. The next prime is 21633164081. The reversal of 21633164047 is 74046133612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21633164047 - 2²³ = 21624775439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21633163997 and 21633164015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21633161047) 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 7 ways as a sum of consecutive naturals, for example, 207954 + ... + 294127.

It is an arithmetic number, because the mean of its divisors is an integer number (2950735914).

Almost surely, 2^21633164047 is an apocalyptic number.

21633164047 is a deficient number, since it is larger than the sum of its proper divisors (1972723265).

21633164047 is a wasteful number, since it uses less digits than its factorization.

21633164047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506009.

The product of its (nonzero) digits is 72576, while the sum is 37.

Adding to 21633164047 its reverse (74046133612), we get a palindrome (95679297659).

The spelling of 21633164047 in words is "twenty-one billion, six hundred thirty-three million, one hundred sixty-four thousand, forty-seven".