210001021120221 has 4 divisors (see below), whose sum is σ = 280001361493632. Its totient is φ = 140000680746812.

The previous prime is 210001021120213. The next prime is 210001021120229. The reversal of 210001021120221 is 122021120100012.

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 an interprime number because it is at equal distance from previous prime (210001021120213) and next prime (210001021120229).

It is a cyclic number.

It is not a de Polignac number, because 210001021120221 - 2³ = 210001021120213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210001021120221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210001021120229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35000170186701 + ... + 35000170186706.

It is an arithmetic number, because the mean of its divisors is an integer number (70000340373408).

Almost surely, 2^{210001021120221} is an apocalyptic number.

It is an amenable number.

210001021120221 is a deficient number, since it is larger than the sum of its proper divisors (70000340373411).

210001021120221 is an equidigital number, since it uses as much as digits as its factorization.

210001021120221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70000340373410.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 210001021120221 its reverse (122021120100012), we get a palindrome (332022141220233).

The spelling of 210001021120221 in words is "two hundred ten trillion, one billion, twenty-one million, one hundred twenty thousand, two hundred twenty-one".