20021104212 has 12 divisors (see below), whose sum is σ = 46715909856. Its totient is φ = 6673701400.

The previous prime is 20021104211. The next prime is 20021104247. The reversal of 20021104212 is 21240112002.

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

It is a super-2 number, since 2×20021104212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 20021104191 and 20021104200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021104211) 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, 834212664 + ... + 834212687.

It is an arithmetic number, because the mean of its divisors is an integer number (3892992488).

Almost surely, 2^20021104212 is an apocalyptic number.

It is an amenable number.

20021104212 is an abundant number, since it is smaller than the sum of its proper divisors (26694805644).

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

20021104212 is a wasteful number, since it uses less digits than its factorization.

20021104212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668425358 (or 1668425356 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 20021104212 its reverse (21240112002), we get a palindrome (41261216214).

The spelling of 20021104212 in words is "twenty billion, twenty-one million, one hundred four thousand, two hundred twelve".