21220334540210 has 64 divisors (see below), whose sum is σ = 41912443772640. Its totient is φ = 7687088947200.

The previous prime is 21220334540191. The next prime is 21220334540221. The reversal of 21220334540210 is 1204543302212.

It can be written as a sum of positive squares in 16 ways, for example, as 115103454361 + 21105231085849 = 339269^2 + 4594043^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 360241760 + ... + 360300660.

Almost surely, 2^{21220334540210} is an apocalyptic number.

21220334540210 is a deficient number, since it is larger than the sum of its proper divisors (20692109232430).

21220334540210 is a wasteful number, since it uses less digits than its factorization.

21220334540210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111263.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 21220334540210 its reverse (1204543302212), we get a palindrome (22424877842422).

The spelling of 21220334540210 in words is "twenty-one trillion, two hundred twenty billion, three hundred thirty-four million, five hundred forty thousand, two hundred ten".