21165032633 has 8 divisors (see below), whose sum is σ = 21754373760. Its totient is φ = 20576602800.

The previous prime is 21165032579. The next prime is 21165032671. The reversal of 21165032633 is 33623056112.

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

It is not a de Polignac number, because 21165032633 - 2²⁰ = 21163984057 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21165032633.

It is not an unprimeable number, because it can be changed into a prime (21165032033) 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, 180593 + ... + 273758.

It is an arithmetic number, because the mean of its divisors is an integer number (2719296720).

Almost surely, 2^21165032633 is an apocalyptic number.

It is an amenable number.

21165032633 is a deficient number, since it is larger than the sum of its proper divisors (589341127).

21165032633 is a wasteful number, since it uses less digits than its factorization.

21165032633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455647.

The product of its (nonzero) digits is 19440, while the sum is 32.

Adding to 21165032633 its reverse (33623056112), we get a palindrome (54788088745).

The spelling of 21165032633 in words is "twenty-one billion, one hundred sixty-five million, thirty-two thousand, six hundred thirty-three".