21200221020212 has 12 divisors (see below), whose sum is σ = 39954262692036. Its totient is φ = 9784717393920.

The previous prime is 21200221020211. The next prime is 21200221020221. The reversal of 21200221020212 is 21202012200212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10455173034916 + 10745047985296 = 3233446^2 + 3277964^2 .

It is a super-2 number, since 2×21200221020212² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221020211) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 203848278989 + ... + 203848279092.

It is an arithmetic number, because the mean of its divisors is an integer number (3329521891003).

Almost surely, 2^{21200221020212} is an apocalyptic number.

It is an amenable number.

21200221020212 is a deficient number, since it is larger than the sum of its proper divisors (18754041671824).

21200221020212 is a wasteful number, since it uses less digits than its factorization.

21200221020212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407696558098 (or 407696558096 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21200221020212 its reverse (21202012200212), we get a palindrome (42402233220424).

The spelling of 21200221020212 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, twenty thousand, two hundred twelve".