212020221 has 32 divisors (see below), whose sum is σ = 341017600. Its totient is φ = 114462720.

The previous prime is 212020213. The next prime is 212020223. The reversal of 212020221 is 122020212.

It is not a de Polignac number, because 212020221 - 2³ = 212020213 is a prime.

It is a super-2 number, since 2×212020221² = 89905148225777682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 212020197 and 212020206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020223) 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 31 ways as a sum of consecutive naturals, for example, 275325 + ... + 276093.

It is an arithmetic number, because the mean of its divisors is an integer number (10656800).

Almost surely, 2^212020221 is an apocalyptic number.

212020221 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

212020221 is a deficient number, since it is larger than the sum of its proper divisors (128997379).

212020221 is a wasteful number, since it uses less digits than its factorization.

212020221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1489.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 212020221 is about 14560.9141539946. The cubic root of 212020221 is about 596.2921530966.

Adding to 212020221 its reverse (122020212), we get a palindrome (334040433).

Subtracting from 212020221 its reverse (122020212), we obtain a palindrome (90000009).

The spelling of 212020221 in words is "two hundred twelve million, twenty thousand, two hundred twenty-one".