212020202021 has 8 divisors (see below), whose sum is σ = 221502843000. Its totient is φ = 202682334400.

The previous prime is 212020202011. The next prime is 212020202077. The reversal of 212020202021 is 120202020212.

It can be written as a sum of positive squares in 4 ways, for example, as 152498841121 + 59521360900 = 390511^2 + 243970^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212020202021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212020201987 and 212020202005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020202011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36190346 + ... + 36196203.

It is an arithmetic number, because the mean of its divisors is an integer number (27687855375).

Almost surely, 2^212020202021 is an apocalyptic number.

It is an amenable number.

212020202021 is a deficient number, since it is larger than the sum of its proper divisors (9482640979).

212020202021 is a wasteful number, since it uses less digits than its factorization.

212020202021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72386679.

The product of its (nonzero) digits is 64, while the sum is 14.

Adding to 212020202021 its reverse (120202020212), we get a palindrome (332222222233).

It can be divided in two parts, 2 and 12020202021, that multiplied together give a palindrome (24040404042).

The spelling of 212020202021 in words is "two hundred twelve billion, twenty million, two hundred two thousand, twenty-one".