2021105156566 has 16 divisors (see below), whose sum is σ = 3164027378400. Its totient is φ = 966444875968.

The previous prime is 2021105156563. The next prime is 2021105156593. The reversal of 2021105156566 is 6656515011202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021105156563) 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 7 ways as a sum of consecutive naturals, for example, 3614431 + ... + 4135978.

It is an arithmetic number, because the mean of its divisors is an integer number (197751711150).

Almost surely, 2^{2021105156566} is an apocalyptic number.

2021105156566 is a deficient number, since it is larger than the sum of its proper divisors (1142922221834).

2021105156566 is a wasteful number, since it uses less digits than its factorization.

2021105156566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7756103.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 2021105156566 in words is "two trillion, twenty-one billion, one hundred five million, one hundred fifty-six thousand, five hundred sixty-six".