21612043436316 has 24 divisors (see below), whose sum is σ = 50692122829824. Its totient is φ = 7166297124720.

The previous prime is 21612043436311. The next prime is 21612043436323. The reversal of 21612043436316 is 61363434021612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21612043436311) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4714666870 + ... + 4714671453.

It is an arithmetic number, because the mean of its divisors is an integer number (2112171784576).

Almost surely, 2^{21612043436316} is an apocalyptic number.

It is an amenable number.

21612043436316 is an abundant number, since it is smaller than the sum of its proper divisors (29080079393508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21612043436316 is a wasteful number, since it uses less digits than its factorization.

21612043436316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9429338521 (or 9429338519 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 42.

Adding to 21612043436316 its reverse (61363434021612), we get a palindrome (82975477457928).

The spelling of 21612043436316 in words is "twenty-one trillion, six hundred twelve billion, forty-three million, four hundred thirty-six thousand, three hundred sixteen".