21066611116562 has 16 divisors (see below), whose sum is σ = 34477797960000. Its totient is φ = 9574298551440.

The previous prime is 21066611116519. The next prime is 21066611116619. The reversal of 21066611116562 is 26561111666012.

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 7 ways as a sum of consecutive naturals, for example, 71538437 + ... + 71832312.

It is an arithmetic number, because the mean of its divisors is an integer number (2154862372500).

Almost surely, 2^{21066611116562} is an apocalyptic number.

21066611116562 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21066611116562 is a deficient number, since it is larger than the sum of its proper divisors (13411186843438).

21066611116562 is a wasteful number, since it uses less digits than its factorization.

21066611116562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143377441.

The product of its (nonzero) digits is 155520, while the sum is 44.

It can be divided in two parts, 2106661 and 1116562, that added together give a palindrome (3223223).

The spelling of 21066611116562 in words is "twenty-one trillion, sixty-six billion, six hundred eleven million, one hundred sixteen thousand, five hundred sixty-two".