210102100101221 has 4 divisors (see below), whose sum is σ = 210102736851744. Its totient is φ = 210101463350700.

The previous prime is 210102100101211. The next prime is 210102100101241. The reversal of 210102100101221 is 122101001201012.

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 210102100101221 - 2¹⁸ = 210102099839077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210102100101196 and 210102100101205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102100101211) 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, 317880065 + ... + 318540326.

It is an arithmetic number, because the mean of its divisors is an integer number (52525684212936).

Almost surely, 2^{210102100101221} is an apocalyptic number.

It is an amenable number.

210102100101221 is a deficient number, since it is larger than the sum of its proper divisors (636750523).

210102100101221 is an equidigital number, since it uses as much as digits as its factorization.

210102100101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636750522.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 210102100101221 its reverse (122101001201012), we get a palindrome (332203101302233).

The spelling of 210102100101221 in words is "two hundred ten trillion, one hundred two billion, one hundred million, one hundred one thousand, two hundred twenty-one".