21216086808044 has 6 divisors (see below), whose sum is σ = 37128151914084. Its totient is φ = 10608043404020.

The previous prime is 21216086808041. The next prime is 21216086808083. The reversal of 21216086808044 is 44080868061212.

It is a junction number, because it is equal to n+sod(n) for n = 21216086807983 and 21216086808001.

It is not an unprimeable number, because it can be changed into a prime (21216086808041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2652010851002 + ... + 2652010851009.

It is an arithmetic number, because the mean of its divisors is an integer number (6188025319014).

Almost surely, 2^{21216086808044} is an apocalyptic number.

It is an amenable number.

21216086808044 is a deficient number, since it is larger than the sum of its proper divisors (15912065106040).

21216086808044 is a wasteful number, since it uses less digits than its factorization.

21216086808044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5304021702015 (or 5304021702013 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 50.

The spelling of 21216086808044 in words is "twenty-one trillion, two hundred sixteen billion, eighty-six million, eight hundred eight thousand, forty-four".