21602425771216 has 20 divisors (see below), whose sum is σ = 42985908039172. Its totient is φ = 10509288212736.

The previous prime is 21602425771133. The next prime is 21602425771249. The reversal of 21602425771216 is 61217752420612.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18733142112400 + 2869283658816 = 4328180^2 + 1693896^2 .

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, 18245291445 + ... + 18245292628.

Almost surely, 2^{21602425771216} is an apocalyptic number.

It is an amenable number.

21602425771216 is a deficient number, since it is larger than the sum of its proper divisors (21383482267956).

21602425771216 is a wasteful number, since it uses less digits than its factorization.

21602425771216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36490584118 (or 36490584112 counting only the distinct ones).

The product of its (nonzero) digits is 564480, while the sum is 46.

The spelling of 21602425771216 in words is "twenty-one trillion, six hundred two billion, four hundred twenty-five million, seven hundred seventy-one thousand, two hundred sixteen".