20211521066 has 16 divisors (see below), whose sum is σ = 33471875808. Its totient is φ = 9076366800.

The previous prime is 20211521053. The next prime is 20211521117. The reversal of 20211521066 is 66012511202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5532545 + ... + 5536196.

It is an arithmetic number, because the mean of its divisors is an integer number (2091992238).

Almost surely, 2^20211521066 is an apocalyptic number.

20211521066 is a deficient number, since it is larger than the sum of its proper divisors (13260354742).

20211521066 is a wasteful number, since it uses less digits than its factorization.

20211521066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11068837.

The product of its (nonzero) digits is 1440, while the sum is 26.

The spelling of 20211521066 in words is "twenty billion, two hundred eleven million, five hundred twenty-one thousand, sixty-six".