210000220102021 has 4 divisors (see below), whose sum is σ = 210001026762252. Its totient is φ = 209999413441792.

The previous prime is 210000220102009. The next prime is 210000220102147. The reversal of 210000220102021 is 120201022000012.

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 96953778873121 + 113046441228900 = 9846511^2 + 10632330^2 .

It is a cyclic number.

It is not a de Polignac number, because 210000220102021 - 2²¹ = 210000218004869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210000220101992 and 210000220102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210000220105021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 402939490 + ... + 403460323.

It is an arithmetic number, because the mean of its divisors is an integer number (52500256690563).

Almost surely, 2^{210000220102021} is an apocalyptic number.

It is an amenable number.

210000220102021 is a deficient number, since it is larger than the sum of its proper divisors (806660231).

210000220102021 is an equidigital number, since it uses as much as digits as its factorization.

210000220102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 806660230.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 210000220102021 its reverse (120201022000012), we get a palindrome (330201242102033).

The spelling of 210000220102021 in words is "two hundred ten trillion, two hundred twenty million, one hundred two thousand, twenty-one".