21603265604216 has 32 divisors (see below), whose sum is σ = 41495394437280. Its totient is φ = 10537843814400.

The previous prime is 21603265604213. The next prime is 21603265604227. The reversal of 21603265604216 is 61240656230612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21603265604213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9463640 + ... + 11522456.

It is an arithmetic number, because the mean of its divisors is an integer number (1296731076165).

Almost surely, 2^{21603265604216} is an apocalyptic number.

It is an amenable number.

21603265604216 is a deficient number, since it is larger than the sum of its proper divisors (19892128833064).

21603265604216 is a wasteful number, since it uses less digits than its factorization.

21603265604216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2090855 (or 2090851 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 44.

The spelling of 21603265604216 in words is "twenty-one trillion, six hundred three billion, two hundred sixty-five million, six hundred four thousand, two hundred sixteen".