21056040932216 has 16 divisors (see below), whose sum is σ = 39480308125440. Its totient is φ = 10527958765440.

The previous prime is 21056040932203. The next prime is 21056040932233. The reversal of 21056040932216 is 61223904065012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6245816 + ... + 9006791.

It is an arithmetic number, because the mean of its divisors is an integer number (2467519257840).

Almost surely, 2^{21056040932216} is an apocalyptic number.

It is an amenable number.

21056040932216 is a deficient number, since it is larger than the sum of its proper divisors (18424267193224).

21056040932216 is a wasteful number, since it uses less digits than its factorization.

21056040932216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15425174 (or 15425170 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 41.

Adding to 21056040932216 its reverse (61223904065012), we get a palindrome (82279944997228).

The spelling of 21056040932216 in words is "twenty-one trillion, fifty-six billion, forty million, nine hundred thirty-two thousand, two hundred sixteen".