210001002120221 has 8 divisors (see below), whose sum is σ = 227093327543544. Its totient is φ = 193042734151680.

The previous prime is 210001002120211. The next prime is 210001002120227. The reversal of 210001002120221 is 122021200100012.

It can be written as a sum of positive squares in 4 ways, for example, as 334627540900 + 209666374579321 = 578470^2 + 14479861^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210001002120221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210001002120196 and 210001002120205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001002120227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33514360436 + ... + 33514366701.

It is an arithmetic number, because the mean of its divisors is an integer number (28386665942943).

Almost surely, 2^{210001002120221} is an apocalyptic number.

It is an amenable number.

210001002120221 is a deficient number, since it is larger than the sum of its proper divisors (17092325423323).

210001002120221 is a wasteful number, since it uses less digits than its factorization.

210001002120221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67028727391.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 210001002120221 its reverse (122021200100012), we get a palindrome (332022202220233).

The spelling of 210001002120221 in words is "two hundred ten trillion, one billion, two million, one hundred twenty thousand, two hundred twenty-one".