21221140170 has 16 divisors (see below), whose sum is σ = 50930736480. Its totient is φ = 5658970704.

The previous prime is 21221140169. The next prime is 21221140183. The reversal of 21221140170 is 7104112212.

It is a super-2 number, since 2×21221140170² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

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, 353685640 + ... + 353685699.

It is an arithmetic number, because the mean of its divisors is an integer number (3183171030).

Almost surely, 2^21221140170 is an apocalyptic number.

21221140170 is an abundant number, since it is smaller than the sum of its proper divisors (29709596310).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21221140170 is a wasteful number, since it uses less digits than its factorization.

21221140170 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 707371349.

The product of its (nonzero) digits is 224, while the sum is 21.

Adding to 21221140170 its reverse (7104112212), we get a palindrome (28325252382).

The spelling of 21221140170 in words is "twenty-one billion, two hundred twenty-one million, one hundred forty thousand, one hundred seventy".