21066060155 has 16 divisors (see below), whose sum is σ = 29480203200. Its totient is φ = 14445297216.

The previous prime is 21066060151. The next prime is 21066060167. The reversal of 21066060155 is 55106066012.

It is not a de Polignac number, because 21066060155 - 2² = 21066060151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21066060151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6139994 + ... + 6143423.

It is an arithmetic number, because the mean of its divisors is an integer number (1842512700).

Almost surely, 2^21066060155 is an apocalyptic number.

21066060155 is a deficient number, since it is larger than the sum of its proper divisors (8414143045).

21066060155 is an equidigital number, since it uses as much as digits as its factorization.

21066060155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12283443 (or 12283429 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The spelling of 21066060155 in words is "twenty-one billion, sixty-six million, sixty thousand, one hundred fifty-five".