21541636216 has 16 divisors (see below), whose sum is σ = 40392314640. Its totient is φ = 10770352320.

The previous prime is 21541636199. The next prime is 21541636243. The reversal of 21541636216 is 61263614512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212221 + ... + 296851.

It is an arithmetic number, because the mean of its divisors is an integer number (2524519665).

Almost surely, 2^21541636216 is an apocalyptic number.

It is an amenable number.

21541636216 is a deficient number, since it is larger than the sum of its proper divisors (18850678424).

21541636216 is a wasteful number, since it uses less digits than its factorization.

21541636216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116454 (or 116450 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

The spelling of 21541636216 in words is "twenty-one billion, five hundred forty-one million, six hundred thirty-six thousand, two hundred sixteen".