21220020201212 has 48 divisors (see below), whose sum is σ = 42865880977920. Its totient is φ = 9003099696192.

The previous prime is 21220020201209. The next prime is 21220020201269. The reversal of 21220020201212 is 21210202002212.

It is a happy number.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 7783043 + ... + 10149669.

It is an arithmetic number, because the mean of its divisors is an integer number (893039187040).

Almost surely, 2^{21220020201212} is an apocalyptic number.

It is an amenable number.

21220020201212 is an abundant number, since it is smaller than the sum of its proper divisors (21645860776708).

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

21220020201212 is a wasteful number, since it uses less digits than its factorization.

21220020201212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2369850 (or 2369848 counting only the distinct ones).

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

Adding to 21220020201212 its reverse (21210202002212), we get a palindrome (42430222203424).

The spelling of 21220020201212 in words is "twenty-one trillion, two hundred twenty billion, twenty million, two hundred one thousand, two hundred twelve".