21000356616244 has 12 divisors (see below), whose sum is σ = 36941041821124. Its totient is φ = 10445773238784.

The previous prime is 21000356616223. The next prime is 21000356616277. The reversal of 21000356616244 is 44261665300012.

It can be written as a sum of positive squares in 2 ways, for example, as 9605276180644 + 11395080435600 = 3099238^2 + 3375660^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21000356616197 and 21000356616206.

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, 13601266467 + ... + 13601268010.

Almost surely, 2^{21000356616244} is an apocalyptic number.

It is an amenable number.

21000356616244 is a deficient number, since it is larger than the sum of its proper divisors (15940685204880).

21000356616244 is a wasteful number, since it uses less digits than its factorization.

21000356616244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27202534674 (or 27202534672 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The spelling of 21000356616244 in words is "twenty-one trillion, three hundred fifty-six million, six hundred sixteen thousand, two hundred forty-four".