21166622662 has 16 divisors (see below), whose sum is σ = 31920537600. Its totient is φ = 10526480712.

The previous prime is 21166622657. The next prime is 21166622663. The reversal of 21166622662 is 26622666112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21166622663) by changing a digit.

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, 1418613 + ... + 1433455.

It is an arithmetic number, because the mean of its divisors is an integer number (1995033600).

Almost surely, 2^21166622662 is an apocalyptic number.

21166622662 is a deficient number, since it is larger than the sum of its proper divisors (10753914938).

21166622662 is a wasteful number, since it uses less digits than its factorization.

21166622662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18627.

The product of its digits is 124416, while the sum is 40.

The spelling of 21166622662 in words is "twenty-one billion, one hundred sixty-six million, six hundred twenty-two thousand, six hundred sixty-two".