212021200220020 has 48 divisors (see below), whose sum is σ = 471441962266128. Its totient is φ = 79818630594560.

The previous prime is 212021200219991. The next prime is 212021200220021. The reversal of 212021200220020 is 20022002120212.

It can be written as a sum of positive squares in 8 ways, for example, as 625070496996 + 211396129723024 = 790614^2 + 14539468^2 .

It is a junction number, because it is equal to n+sod(n) for n = 212021200219976 and 212021200220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021200220021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20213904 + ... + 28855576.

It is an arithmetic number, because the mean of its divisors is an integer number (9821707547211).

Almost surely, 2^{212021200220020} is an apocalyptic number.

212021200220020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

212021200220020 is an abundant number, since it is smaller than the sum of its proper divisors (259420762046108).

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

212021200220020 is a wasteful number, since it uses less digits than its factorization.

212021200220020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713860 (or 8713858 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 212021200220020 its reverse (20022002120212), we get a palindrome (232043202340232).

The spelling of 212021200220020 in words is "two hundred twelve trillion, twenty-one billion, two hundred million, two hundred twenty thousand, twenty".