21610706217156 has 72 divisors (see below), whose sum is σ = 62540649924480. Its totient is φ = 6163635977856.

The previous prime is 21610706217143. The next prime is 21610706217167. The reversal of 21610706217156 is 65171260701612.

21610706217156 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 0 + 7 + 0 + 621 + 7 + 15 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 75214056 + ... + 75500831.

It is an arithmetic number, because the mean of its divisors is an integer number (868620137840).

Almost surely, 2^{21610706217156} is an apocalyptic number.

It is an amenable number.

21610706217156 is an abundant number, since it is smaller than the sum of its proper divisors (40929943707324).

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

21610706217156 is a wasteful number, since it uses less digits than its factorization.

21610706217156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150715473 (or 150715468 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

Adding to 21610706217156 its reverse (65171260701612), we get a palindrome (86781966918768).

The spelling of 21610706217156 in words is "twenty-one trillion, six hundred ten billion, seven hundred six million, two hundred seventeen thousand, one hundred fifty-six".