21161166661162 has 8 divisors (see below), whose sum is σ = 34627363627392. Its totient is φ = 9618712118700.

The previous prime is 21161166661157. The next prime is 21161166661163. The reversal of 21161166661162 is 26116666116112.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21161166661162² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21161166661163) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 480935605914 + ... + 480935605957.

It is an arithmetic number, because the mean of its divisors is an integer number (4328420453424).

Almost surely, 2^{21161166661162} is an apocalyptic number.

21161166661162 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21161166661162 is a deficient number, since it is larger than the sum of its proper divisors (13466196966230).

21161166661162 is a wasteful number, since it uses less digits than its factorization.

21161166661162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961871211884.

The product of its digits is 186624, while the sum is 46.

The spelling of 21161166661162 in words is "twenty-one trillion, one hundred sixty-one billion, one hundred sixty-six million, six hundred sixty-one thousand, one hundred sixty-two".