1020210220021 has 2 divisors, whose sum is σ = 1020210220022. Its totient is φ = 1020210220020.

The previous prime is 1020210220009. The next prime is 1020210220031. The reversal of 1020210220021 is 1200220120201.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 834091317796 + 186118902225 = 913286^2 + 431415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020210220021 - 2⁵ = 1020210219989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020210219983 and 1020210220010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020210220031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510105110010 + 510105110011.

It is an arithmetic number, because the mean of its divisors is an integer number (510105110011).

Almost surely, 2^{1020210220021} is an apocalyptic number.

It is an amenable number.

1020210220021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020210220021 is an equidigital number, since it uses as much as digits as its factorization.

1020210220021 is an odious number, because the sum of its binary digits is odd.

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

Adding to 1020210220021 its reverse (1200220120201), we get a palindrome (2220430340222).

The spelling of 1020210220021 in words is "one trillion, twenty billion, two hundred ten million, two hundred twenty thousand, twenty-one".