212020002120221 has 4 divisors (see below), whose sum is σ = 212020324393692. Its totient is φ = 212019679846752.

The previous prime is 212020002120203. The next prime is 212020002120257. The reversal of 212020002120221 is 122021200020212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 80154167728996 + 131865834391225 = 8952886^2 + 11483285^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212020002120221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212020002120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212020002720221) 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, 160147880 + ... + 161466353.

It is an arithmetic number, because the mean of its divisors is an integer number (53005081098423).

Almost surely, 2^{212020002120221} is an apocalyptic number.

It is an amenable number.

212020002120221 is a deficient number, since it is larger than the sum of its proper divisors (322273471).

212020002120221 is an equidigital number, since it uses as much as digits as its factorization.

212020002120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322273470.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 212020002120221 its reverse (122021200020212), we get a palindrome (334041202140433).

The spelling of 212020002120221 in words is "two hundred twelve trillion, twenty billion, two million, one hundred twenty thousand, two hundred twenty-one".