21623522135165 has 8 divisors (see below), whose sum is σ = 25959263678208. Its totient is φ = 17291459630800.

The previous prime is 21623522135143. The next prime is 21623522135233. The reversal of 21623522135165 is 56153122532612.

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

It is not a de Polignac number, because 21623522135165 - 2³⁰ = 21622448393341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 919746737 + ... + 919770246.

It is an arithmetic number, because the mean of its divisors is an integer number (3244907959776).

Almost surely, 2^{21623522135165} is an apocalyptic number.

It is an amenable number.

21623522135165 is a deficient number, since it is larger than the sum of its proper divisors (4335741543043).

21623522135165 is a wasteful number, since it uses less digits than its factorization.

21623522135165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1839519339.

The product of its digits is 648000, while the sum is 44.

Adding to 21623522135165 its reverse (56153122532612), we get a palindrome (77776644667777).

The spelling of 21623522135165 in words is "twenty-one trillion, six hundred twenty-three billion, five hundred twenty-two million, one hundred thirty-five thousand, one hundred sixty-five".