21216362454064 has 20 divisors (see below), whose sum is σ = 41112197300520. Its totient is φ = 10606763150720.

The previous prime is 21216362454031. The next prime is 21216362454073. The reversal of 21216362454064 is 46045426361212.

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, 88506334 + ... + 88745725.

It is an arithmetic number, because the mean of its divisors is an integer number (2055609865026).

Almost surely, 2^{21216362454064} is an apocalyptic number.

It is an amenable number.

21216362454064 is a deficient number, since it is larger than the sum of its proper divisors (19895834846456).

21216362454064 is a wasteful number, since it uses less digits than its factorization.

21216362454064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177259548 (or 177259542 counting only the distinct ones).

The product of its (nonzero) digits is 1658880, while the sum is 46.

The spelling of 21216362454064 in words is "twenty-one trillion, two hundred sixteen billion, three hundred sixty-two million, four hundred fifty-four thousand, sixty-four".