12021660105 has 32 divisors (see below), whose sum is σ = 23673425664. Its totient is φ = 5072875776.

The previous prime is 12021660067. The next prime is 12021660169. The reversal of 12021660105 is 50106612021.

It is not a de Polignac number, because 12021660105 - 2⁷ = 12021659977 is a prime.

It is a super-2 number, since 2×12021660105² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 4402174 + ... + 4404903.

It is an arithmetic number, because the mean of its divisors is an integer number (739794552).

Almost surely, 2^12021660105 is an apocalyptic number.

12021660105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12021660105 is a deficient number, since it is larger than the sum of its proper divisors (11651765559).

12021660105 is a wasteful number, since it uses less digits than its factorization.

12021660105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8807105.

The product of its (nonzero) digits is 720, while the sum is 24.

The spelling of 12021660105 in words is "twelve billion, twenty-one million, six hundred sixty thousand, one hundred five".