210220002120221 has 4 divisors (see below), whose sum is σ = 210222029789244. Its totient is φ = 210217974451200.

The previous prime is 210220002120217. The next prime is 210220002120239. The reversal of 210220002120221 is 122021200022012.

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 68068869148996 + 142151132971225 = 8250386^2 + 11922715^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220002120221 - 2² = 210220002120217 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 210220002120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220002120251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1013678990 + ... + 1013886351.

It is an arithmetic number, because the mean of its divisors is an integer number (52555507447311).

Almost surely, 2^{210220002120221} is an apocalyptic number.

It is an amenable number.

210220002120221 is a deficient number, since it is larger than the sum of its proper divisors (2027669023).

210220002120221 is a wasteful number, since it uses less digits than its factorization.

210220002120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2027669022.

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

Adding to 210220002120221 its reverse (122021200022012), we get a palindrome (332241202142233).

The spelling of 210220002120221 in words is "two hundred ten trillion, two hundred twenty billion, two million, one hundred twenty thousand, two hundred twenty-one".