21115665054562 has 32 divisors (see below), whose sum is σ = 36884820172032. Its totient is φ = 8977257801984.

The previous prime is 21115665054557. The next prime is 21115665054569. The reversal of 21115665054562 is 26545056651112.

It is not an unprimeable number, because it can be changed into a prime (21115665054569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 508202608 + ... + 508244155.

It is an arithmetic number, because the mean of its divisors is an integer number (1152650630376).

Almost surely, 2^{21115665054562} is an apocalyptic number.

21115665054562 is a deficient number, since it is larger than the sum of its proper divisors (15769155117470).

21115665054562 is a wasteful number, since it uses less digits than its factorization.

21115665054562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1016446842.

The product of its (nonzero) digits is 2160000, while the sum is 49.

The spelling of 21115665054562 in words is "twenty-one trillion, one hundred fifteen billion, six hundred sixty-five million, fifty-four thousand, five hundred sixty-two".