210102102111221 has 16 divisors (see below), whose sum is σ = 226186019536176. Its totient is φ = 194458039566336.

The previous prime is 210102102111217. The next prime is 210102102111241. The reversal of 210102102111221 is 122111201201012.

It can be written as a sum of positive squares in 8 ways, for example, as 28873588762225 + 181228513348996 = 5373415^2 + 13462114^2 .

It is a cyclic number.

It is not a de Polignac number, because 210102102111221 - 2² = 210102102111217 is a prime.

It is a super-2 number, since 2×210102102111221² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 210102102111221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210102102111211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 405511256 + ... + 406029041.

It is an arithmetic number, because the mean of its divisors is an integer number (14136626221011).

Almost surely, 2^{210102102111221} is an apocalyptic number.

It is an amenable number.

210102102111221 is a deficient number, since it is larger than the sum of its proper divisors (16083917424955).

210102102111221 is a wasteful number, since it uses less digits than its factorization.

210102102111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811540568.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 210102102111221 its reverse (122111201201012), we get a palindrome (332213303312233).

The spelling of 210102102111221 in words is "two hundred ten trillion, one hundred two billion, one hundred two million, one hundred eleven thousand, two hundred twenty-one".