212021020221 has 32 divisors (see below), whose sum is σ = 298010099712. Its totient is φ = 133817080320.

The previous prime is 212021020207. The next prime is 212021020247. The reversal of 212021020221 is 122020120212.

It is not a de Polignac number, because 212021020221 - 2⁷ = 212021020093 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 212021020221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021020621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15223341 + ... + 15237261.

It is an arithmetic number, because the mean of its divisors is an integer number (9312815616).

Almost surely, 2^212021020221 is an apocalyptic number.

It is an amenable number.

212021020221 is a deficient number, since it is larger than the sum of its proper divisors (85989079491).

212021020221 is a wasteful number, since it uses less digits than its factorization.

212021020221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16193.

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

Adding to 212021020221 its reverse (122020120212), we get a palindrome (334041140433).

Subtracting from 212021020221 its reverse (122020120212), we obtain a palindrome (90000900009).

The spelling of 212021020221 in words is "two hundred twelve billion, twenty-one million, twenty thousand, two hundred twenty-one".