21214222180 has 24 divisors (see below), whose sum is σ = 44632236600. Its totient is φ = 8469999360.

The previous prime is 21214222039. The next prime is 21214222193. The reversal of 21214222180 is 8122241212.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 91087936 + 21123134244 = 9544^2 + 145338^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969505 + ... + 991144.

It is an arithmetic number, because the mean of its divisors is an integer number (1859676525).

Almost surely, 2^21214222180 is an apocalyptic number.

21214222180 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21214222180 is an abundant number, since it is smaller than the sum of its proper divisors (23418014420).

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

21214222180 is a wasteful number, since it uses less digits than its factorization.

21214222180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961199 (or 1961197 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

Adding to 21214222180 its reverse (8122241212), we get a palindrome (29336463392).

The spelling of 21214222180 in words is "twenty-one billion, two hundred fourteen million, two hundred twenty-two thousand, one hundred eighty".