221000210010121 has 4 divisors (see below), whose sum is σ = 224623164272644. Its totient is φ = 217377255747600.

The previous prime is 221000210010109. The next prime is 221000210010133. The reversal of 221000210010121 is 121010012000122.

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

It is an interprime number because it is at equal distance from previous prime (221000210010109) and next prime (221000210010133).

It can be written as a sum of positive squares in 2 ways, for example, as 43555564912896 + 177444645097225 = 6599664^2 + 13320835^2 .

It is a cyclic number.

It is not a de Polignac number, because 221000210010121 - 2³⁵ = 220965850271753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221000210010191) 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, 1811477131170 + ... + 1811477131291.

It is an arithmetic number, because the mean of its divisors is an integer number (56155791068161).

Almost surely, 2^{221000210010121} is an apocalyptic number.

It is an amenable number.

221000210010121 is a deficient number, since it is larger than the sum of its proper divisors (3622954262523).

221000210010121 is an equidigital number, since it uses as much as digits as its factorization.

221000210010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622954262522.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221000210010121 its reverse (121010012000122), we get a palindrome (342010222010243).

The spelling of 221000210010121 in words is "two hundred twenty-one trillion, two hundred ten million, ten thousand, one hundred twenty-one".