210220222021 has 4 divisors (see below), whose sum is σ = 222586117452. Its totient is φ = 197854326592.

The previous prime is 210220222001. The next prime is 210220222061. The reversal of 210220222021 is 120222022012.

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 197762537025 + 12457684996 = 444705^2 + 111614^2 .

It is a cyclic number.

It is not a de Polignac number, because 210220222021 - 2²¹ = 210218124869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210220221986 and 210220222004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210220222001) 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, 6182947690 + ... + 6182947723.

It is an arithmetic number, because the mean of its divisors is an integer number (55646529363).

Almost surely, 2^210220222021 is an apocalyptic number.

It is an amenable number.

210220222021 is a deficient number, since it is larger than the sum of its proper divisors (12365895431).

210220222021 is a wasteful number, since it uses less digits than its factorization.

210220222021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12365895430.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 210220222021 its reverse (120222022012), we get a palindrome (330442244033).

Subtracting from 210220222021 its reverse (120222022012), we obtain a square (89998200009 = 299997²).

The spelling of 210220222021 in words is "two hundred ten billion, two hundred twenty million, two hundred twenty-two thousand, twenty-one".