201821575516016 has 20 divisors (see below), whose sum is σ = 408030576587472. Its totient is φ = 96523362203136.

The previous prime is 201821575516013. The next prime is 201821575516097. The reversal of 201821575516016 is 610615575128102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201821575516013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 274214096801 + ... + 274214097536.

Almost surely, 2^{201821575516016} is an apocalyptic number.

It is an amenable number.

201821575516016 is an abundant number, since it is smaller than the sum of its proper divisors (206209001071456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

201821575516016 is a wasteful number, since it uses less digits than its factorization.

201821575516016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 548428194368 (or 548428194362 counting only the distinct ones).

The product of its (nonzero) digits is 1008000, while the sum is 50.

The spelling of 201821575516016 in words is "two hundred one trillion, eight hundred twenty-one billion, five hundred seventy-five million, five hundred sixteen thousand, sixteen".