21220219212 has 12 divisors (see below), whose sum is σ = 49513844856. Its totient is φ = 7073406400.

The previous prime is 21220219211. The next prime is 21220219219. The reversal of 21220219212 is 21291202212.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (21220219211) 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, 884175789 + ... + 884175812.

It is an arithmetic number, because the mean of its divisors is an integer number (4126153738).

Almost surely, 2^21220219212 is an apocalyptic number.

It is an amenable number.

21220219212 is an abundant number, since it is smaller than the sum of its proper divisors (28293625644).

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

21220219212 is a wasteful number, since it uses less digits than its factorization.

21220219212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1768351608 (or 1768351606 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21220219212 in words is "twenty-one billion, two hundred twenty million, two hundred nineteen thousand, two hundred twelve".