210220001221121 has 4 divisors (see below), whose sum is σ = 217468966780500. Its totient is φ = 202971035661744.

The previous prime is 210220001221049. The next prime is 210220001221129. The reversal of 210220001221121 is 121122100022012.

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 138293742746896 + 71926258474225 = 11759836^2 + 8480935^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220001221121 - 2²² = 210219997026817 is a prime.

It is a super-2 number, since 2×210220001221121² (a number of 29 digits) contains 22 as substring.

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 210220001221121.

It is not an unprimeable number, because it can be changed into a prime (210220001221129) 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, 3624482779646 + ... + 3624482779703.

It is an arithmetic number, because the mean of its divisors is an integer number (54367241695125).

Almost surely, 2^{210220001221121} is an apocalyptic number.

It is an amenable number.

210220001221121 is a deficient number, since it is larger than the sum of its proper divisors (7248965559379).

210220001221121 is an equidigital number, since it uses as much as digits as its factorization.

210220001221121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7248965559378.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 210220001221121 its reverse (121122100022012), we get a palindrome (331342101243133).

The spelling of 210220001221121 in words is "two hundred ten trillion, two hundred twenty billion, one million, two hundred twenty-one thousand, one hundred twenty-one".