21205323630273 has 32 divisors (see below), whose sum is σ = 28490821632000. Its totient is φ = 14028558984000.

The previous prime is 21205323630259. The next prime is 21205323630317. The reversal of 21205323630273 is 37203632350212.

It is not a de Polignac number, because 21205323630273 - 2¹² = 21205323626177 is a prime.

It is a super-2 number, since 2×21205323630273² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21205323630203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2033298423 + ... + 2033308851.

It is an arithmetic number, because the mean of its divisors is an integer number (890338176000).

Almost surely, 2^{21205323630273} is an apocalyptic number.

It is an amenable number.

21205323630273 is a deficient number, since it is larger than the sum of its proper divisors (7285498001727).

21205323630273 is a wasteful number, since it uses less digits than its factorization.

21205323630273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14853.

The product of its (nonzero) digits is 272160, while the sum is 39.

Adding to 21205323630273 its reverse (37203632350212), we get a palindrome (58408955980485).

The spelling of 21205323630273 in words is "twenty-one trillion, two hundred five billion, three hundred twenty-three million, six hundred thirty thousand, two hundred seventy-three".