21161144164622 has 32 divisors (see below), whose sum is σ = 39621940611840. Its totient is φ = 8234632284480.

The previous prime is 21161144164597. The next prime is 21161144164627. The reversal of 21161144164622 is 22646144116112.

It is a self number, because there is not a number n which added to its sum of digits gives 21161144164622.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21161144164627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82950047 + ... + 83204762.

It is an arithmetic number, because the mean of its divisors is an integer number (1238185644120).

Almost surely, 2^{21161144164622} is an apocalyptic number.

21161144164622 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21161144164622 is a deficient number, since it is larger than the sum of its proper divisors (18460796447218).

21161144164622 is a wasteful number, since it uses less digits than its factorization.

21161144164622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166155656.

The product of its digits is 110592, while the sum is 41.

The spelling of 21161144164622 in words is "twenty-one trillion, one hundred sixty-one billion, one hundred forty-four million, one hundred sixty-four thousand, six hundred twenty-two".