212021120221 has 4 divisors (see below), whose sum is σ = 212661667744. Its totient is φ = 211380572700.

The previous prime is 212021120093. The next prime is 212021120249. The reversal of 212021120221 is 122021120212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 212021120221 - 2⁷ = 212021120093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212021120195 and 212021120204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212021120021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320273265 + ... + 320273926.

It is an arithmetic number, because the mean of its divisors is an integer number (53165416936).

Almost surely, 2^212021120221 is an apocalyptic number.

It is an amenable number.

212021120221 is a deficient number, since it is larger than the sum of its proper divisors (640547523).

212021120221 is an equidigital number, since it uses as much as digits as its factorization.

212021120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640547522.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 212021120221 its reverse (122021120212), we get a palindrome (334042240433).

Subtracting from 212021120221 its reverse (122021120212), we obtain a palindrome (90000000009).

The spelling of 212021120221 in words is "two hundred twelve billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".