210100022021221 has 4 divisors (see below), whose sum is σ = 210241885643244. Its totient is φ = 209958158399200.

The previous prime is 210100022021203. The next prime is 210100022021251. The reversal of 210100022021221 is 122120220001012.

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 29887815650625 + 180212206370596 = 5466975^2 + 13424314^2 .

It is a cyclic number.

It is not a de Polignac number, because 210100022021221 - 2¹⁷ = 210100021890149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210100022021195 and 210100022021204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210100022021251) 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, 70931808790 + ... + 70931811751.

It is an arithmetic number, because the mean of its divisors is an integer number (52560471410811).

Almost surely, 2^{210100022021221} is an apocalyptic number.

It is an amenable number.

210100022021221 is a deficient number, since it is larger than the sum of its proper divisors (141863622023).

210100022021221 is a wasteful number, since it uses less digits than its factorization.

210100022021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141863622022.

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

Adding to 210100022021221 its reverse (122120220001012), we get a palindrome (332220242022233).

The spelling of 210100022021221 in words is "two hundred ten trillion, one hundred billion, twenty-two million, twenty-one thousand, two hundred twenty-one".