210221221102021 has 4 divisors (see below), whose sum is σ = 210794030969152. Its totient is φ = 209648411234892.

The previous prime is 210221221101907. The next prime is 210221221102063. The reversal of 210221221102021 is 120201122122012.

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 a cyclic number.

It is not a de Polignac number, because 210221221102021 - 2⁹ = 210221221101509 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 210221221102021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221291102021) 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, 286404933015 + ... + 286404933748.

It is an arithmetic number, because the mean of its divisors is an integer number (52698507742288).

Almost surely, 2^{210221221102021} is an apocalyptic number.

It is an amenable number.

210221221102021 is a deficient number, since it is larger than the sum of its proper divisors (572809867131).

210221221102021 is an equidigital number, since it uses as much as digits as its factorization.

210221221102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572809867130.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 210221221102021 its reverse (120201122122012), we get a palindrome (330422343224033).

The spelling of 210221221102021 in words is "two hundred ten trillion, two hundred twenty-one billion, two hundred twenty-one million, one hundred two thousand, twenty-one".