220210210021 has 2 divisors, whose sum is σ = 220210210022. Its totient is φ = 220210210020.

The previous prime is 220210210001. The next prime is 220210210081. The reversal of 220210210021 is 120012012022.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 217306077921 + 2904132100 = 466161^2 + 53890^2 .

It is a cyclic number.

It is not a de Polignac number, because 220210210021 - 2¹⁹ = 220209685733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220210209983 and 220210210010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220210210001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110105105010 + 110105105011.

It is an arithmetic number, because the mean of its divisors is an integer number (110105105011).

Almost surely, 2^220210210021 is an apocalyptic number.

It is an amenable number.

220210210021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220210210021 is an equidigital number, since it uses as much as digits as its factorization.

220210210021 is an evil number, because the sum of its binary digits is even.

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

Adding to 220210210021 its reverse (120012012022), we get a palindrome (340222222043).

The spelling of 220210210021 in words is "two hundred twenty billion, two hundred ten million, two hundred ten thousand, twenty-one".