210210102321221 has 4 divisors (see below), whose sum is σ = 210210260897772. Its totient is φ = 210209943744672.

The previous prime is 210210102321173. The next prime is 210210102321353. The reversal of 210210102321221 is 122123201012012.

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

It can be written as a sum of positive squares in 2 ways, for example, as 6762527436196 + 203447574885025 = 2600486^2 + 14263505^2 .

It is a cyclic number.

It is not a de Polignac number, because 210210102321221 - 2¹⁴ = 210210102304837 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210210102321193 and 210210102321202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210210102371221) 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, 77282960 + ... + 79956713.

It is an arithmetic number, because the mean of its divisors is an integer number (52552565224443).

Almost surely, 2^{210210102321221} is an apocalyptic number.

It is an amenable number.

210210102321221 is a deficient number, since it is larger than the sum of its proper divisors (158576551).

210210102321221 is a wasteful number, since it uses less digits than its factorization.

210210102321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158576550.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 210210102321221 its reverse (122123201012012), we get a palindrome (332333303333233).

The spelling of 210210102321221 in words is "two hundred ten trillion, two hundred ten billion, one hundred two million, three hundred twenty-one thousand, two hundred twenty-one".