220001121122021 has 2 divisors, whose sum is σ = 220001121122022. Its totient is φ = 220001121122020.

The previous prime is 220001121121993. The next prime is 220001121122051. The reversal of 220001121122021 is 120221121100022.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181932591321121 + 38068529800900 = 13488239^2 + 6169970^2 .

It is a cyclic number.

It is not a de Polignac number, because 220001121122021 - 2¹⁰ = 220001121120997 is a prime.

It is a super-2 number, since 2×220001121122021² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220001121122051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110000560561010 + 110000560561011.

It is an arithmetic number, because the mean of its divisors is an integer number (110000560561011).

Almost surely, 2^{220001121122021} is an apocalyptic number.

It is an amenable number.

220001121122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220001121122021 is an equidigital number, since it uses as much as digits as its factorization.

220001121122021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 220001121122021 its reverse (120221121100022), we get a palindrome (340222242222043).

The spelling of 220001121122021 in words is "two hundred twenty trillion, one billion, one hundred twenty-one million, one hundred twenty-two thousand, twenty-one".