210120102200221 has 4 divisors (see below), whose sum is σ = 210176876076444. Its totient is φ = 210063328324000.

The previous prime is 210120102200153. The next prime is 210120102200227. The reversal of 210120102200221 is 122002201021012.

It is a happy number.

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 97783717759225 + 112336384440996 = 9888565^2 + 10598886^2 .

It is a cyclic number.

It is not a de Polignac number, because 210120102200221 - 2⁷ = 210120102200093 is a prime.

It is a super-4 number, since 4×210120102200221⁴ (a number of 58 digits) contains 4444 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210120102200195 and 210120102200204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210120102200227) 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, 28386932560 + ... + 28386939961.

It is an arithmetic number, because the mean of its divisors is an integer number (52544219019111).

Almost surely, 2^{210120102200221} is an apocalyptic number.

It is an amenable number.

210120102200221 is a deficient number, since it is larger than the sum of its proper divisors (56773876223).

210120102200221 is an equidigital number, since it uses as much as digits as its factorization.

210120102200221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56773876222.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 210120102200221 its reverse (122002201021012), we get a palindrome (332122303221233).

The spelling of 210120102200221 in words is "two hundred ten trillion, one hundred twenty billion, one hundred two million, two hundred thousand, two hundred twenty-one".