21216020416146 has 12 divisors (see below), whose sum is σ = 45968044235022. Its totient is φ = 7072006805376.

The previous prime is 21216020416091. The next prime is 21216020416169. The reversal of 21216020416146 is 64161402061212.

21216020416146 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 602 + 0 + 4 + 1 + 6 + 1 + 46 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19927429920225 + 1288590495921 = 4464015^2 + 1135161^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21216020416146.

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 5 ways as a sum of consecutive naturals, for example, 589333900431 + ... + 589333900466.

Almost surely, 2^{21216020416146} is an apocalyptic number.

21216020416146 is an abundant number, since it is smaller than the sum of its proper divisors (24752023818876).

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

21216020416146 is a wasteful number, since it uses less digits than its factorization.

21216020416146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1178667800905 (or 1178667800902 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

Adding to 21216020416146 its reverse (64161402061212), we get a palindrome (85377422477358).

The spelling of 21216020416146 in words is "twenty-one trillion, two hundred sixteen billion, twenty million, four hundred sixteen thousand, one hundred forty-six".