21261068676066 has 16 divisors (see below), whose sum is σ = 42562673244000. Its totient is φ = 7080266910048.

The previous prime is 21261068676031. The next prime is 21261068676073. The reversal of 21261068676066 is 66067686016212.

It is a junction number, because it is equal to n+sod(n) for n = 21261068675997 and 21261068676015.

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, 1688988676 + ... + 1689001263.

It is an arithmetic number, because the mean of its divisors is an integer number (2660167077750).

Almost surely, 2^{21261068676066} is an apocalyptic number.

21261068676066 is an abundant number, since it is smaller than the sum of its proper divisors (21301604567934).

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

21261068676066 is a wasteful number, since it uses less digits than its factorization.

21261068676066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377990993.

The product of its (nonzero) digits is 10450944, while the sum is 57.

The spelling of 21261068676066 in words is "twenty-one trillion, two hundred sixty-one billion, sixty-eight million, six hundred seventy-six thousand, sixty-six".