21116021206066 has 32 divisors (see below), whose sum is σ = 32247838022400. Its totient is φ = 10368770783040.

The previous prime is 21116021206019. The next prime is 21116021206069. The reversal of 21116021206066 is 66060212061112.

It is not an unprimeable number, because it can be changed into a prime (21116021206069) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12596920 + ... + 14174428.

It is an arithmetic number, because the mean of its divisors is an integer number (1007744938200).

Almost surely, 2^{21116021206066} is an apocalyptic number.

21116021206066 is a deficient number, since it is larger than the sum of its proper divisors (11131816816334).

21116021206066 is a wasteful number, since it uses less digits than its factorization.

21116021206066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578154.

The product of its (nonzero) digits is 10368, while the sum is 34.

Adding to 21116021206066 its reverse (66060212061112), we get a palindrome (87176233267178).

The spelling of 21116021206066 in words is "twenty-one trillion, one hundred sixteen billion, twenty-one million, two hundred six thousand, sixty-six".