21616426312106 has 8 divisors (see below), whose sum is σ = 32426624739684. Its totient is φ = 10807551398880.

The previous prime is 21616426312097. The next prime is 21616426312123. The reversal of 21616426312106 is 60121362461612.

It can be written as a sum of positive squares in 2 ways, for example, as 21379850107225 + 236576204881 = 4623835^2 + 486391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 330837755 + ... + 330903086.

Almost surely, 2^{21616426312106} is an apocalyptic number.

21616426312106 is a deficient number, since it is larger than the sum of its proper divisors (10810198427578).

21616426312106 is a wasteful number, since it uses less digits than its factorization.

21616426312106 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661757176.

The product of its (nonzero) digits is 124416, while the sum is 41.

Adding to 21616426312106 its reverse (60121362461612), we get a palindrome (81737788773718).

It can be divided in two parts, 2161642 and 6312106, that added together give a palindrome (8473748).

The spelling of 21616426312106 in words is "twenty-one trillion, six hundred sixteen billion, four hundred twenty-six million, three hundred twelve thousand, one hundred six".