210220221121 has 4 divisors (see below), whose sum is σ = 210228986500. Its totient is φ = 210211455744.

The previous prime is 210220221109. The next prime is 210220221131. The reversal of 210220221121 is 121122022012.

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 166516228096 + 43703993025 = 408064^2 + 209055^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220221121 - 2¹³ = 210220212929 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210220221095 and 210220221104.

It is not an unprimeable number, because it can be changed into a prime (210220221131) 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, 4346616 + ... + 4394713.

It is an arithmetic number, because the mean of its divisors is an integer number (52557246625).

Almost surely, 2^210220221121 is an apocalyptic number.

It is an amenable number.

210220221121 is a deficient number, since it is larger than the sum of its proper divisors (8765379).

210220221121 is an equidigital number, since it uses as much as digits as its factorization.

210220221121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8765378.

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

Adding to 210220221121 its reverse (121122022012), we get a palindrome (331342243133).

The spelling of 210220221121 in words is "two hundred ten billion, two hundred twenty million, two hundred twenty-one thousand, one hundred twenty-one".