220102010021 has 2 divisors, whose sum is σ = 220102010022. Its totient is φ = 220102010020.

The previous prime is 220102009997. The next prime is 220102010041. The reversal of 220102010021 is 120010201022.

It is a happy number.

220102010021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 133009737025 + 87092272996 = 364705^2 + 295114^2 .

It is a cyclic number.

It is not a de Polignac number, because 220102010021 - 2²⁶ = 220034901157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 220102009984 and 220102010011.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (220102010041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110051005010 + 110051005011.

It is an arithmetic number, because the mean of its divisors is an integer number (110051005011).

Almost surely, 2^220102010021 is an apocalyptic number.

It is an amenable number.

220102010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

220102010021 is an equidigital number, since it uses as much as digits as its factorization.

220102010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 220102010021 its reverse (120010201022), we get a palindrome (340112211043).

The spelling of 220102010021 in words is "two hundred twenty billion, one hundred two million, ten thousand, twenty-one".