21212020110212 has 12 divisors (see below), whose sum is σ = 39304625498460. Its totient is φ = 9982127110656.

The previous prime is 21212020110187. The next prime is 21212020110227. The reversal of 21212020110212 is 21201102021212.

It can be written as a sum of positive squares in 2 ways, for example, as 9916667057476 + 11295353052736 = 3149074^2 + 3360856^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155970736037 + ... + 155970736172.

It is an arithmetic number, because the mean of its divisors is an integer number (3275385458205).

Almost surely, 2^{21212020110212} is an apocalyptic number.

It is an amenable number.

21212020110212 is a deficient number, since it is larger than the sum of its proper divisors (18092605388248).

21212020110212 is a wasteful number, since it uses less digits than its factorization.

21212020110212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311941472230 (or 311941472228 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21212020110212 its reverse (21201102021212), we get a palindrome (42413122131424).

The spelling of 21212020110212 in words is "twenty-one trillion, two hundred twelve billion, twenty million, one hundred ten thousand, two hundred twelve".