21216426315066 has 24 divisors (see below), whose sum is σ = 46616373314784. Its totient is φ = 6972534469320.

The previous prime is 21216426315061. The next prime is 21216426315113. The reversal of 21216426315066 is 66051362461212.

21216426315066 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 6 + 4 + 2 + 631 + 5 + 0 + 6 + 6 = 666.

It is not an unprimeable number, because it can be changed into a prime (21216426315061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8300634996 + ... + 8300637551.

It is an arithmetic number, because the mean of its divisors is an integer number (1942348888116).

Almost surely, 2^{21216426315066} is an apocalyptic number.

21216426315066 is an abundant number, since it is smaller than the sum of its proper divisors (25399946999718).

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

21216426315066 is a wasteful number, since it uses less digits than its factorization.

21216426315066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16601272626 (or 16601272623 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

Adding to 21216426315066 its reverse (66051362461212), we get a palindrome (87267788776278).

The spelling of 21216426315066 in words is "twenty-one trillion, two hundred sixteen billion, four hundred twenty-six million, three hundred fifteen thousand, sixty-six".