20021212020100 has 18 divisors (see below), whose sum is σ = 43446030083834. Its totient is φ = 8008484808000.

The previous prime is 20021212020071. The next prime is 20021212020143. The reversal of 20021212020100 is 102021212002.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3230165074756 + 16791046945344 = 1797266^2 + 4097688^2 .

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 5 ways as a sum of consecutive naturals, for example, 100106060001 + ... + 100106060200.

Almost surely, 2^{20021212020100} is an apocalyptic number.

20021212020100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20021212020100 is an abundant number, since it is smaller than the sum of its proper divisors (23424818063734).

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

20021212020100 is a wasteful number, since it uses less digits than its factorization.

20021212020100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200212120215 (or 200212120208 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20021212020100 its reverse (102021212002), we get a palindrome (20123233232102).

The spelling of 20021212020100 in words is "twenty trillion, twenty-one billion, two hundred twelve million, twenty thousand, one hundred".