1020220120021 has 2 divisors, whose sum is σ = 1020220120022. Its totient is φ = 1020220120020.

The previous prime is 1020220119977. The next prime is 1020220120081. The reversal of 1020220120021 is 1200210220201.

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., 928235902500 + 91984217521 = 963450^2 + 303289^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020220120021 - 2²¹ = 1020218022869 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1020220119983 and 1020220120010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1020220120081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510110060010 + 510110060011.

It is an arithmetic number, because the mean of its divisors is an integer number (510110060011).

Almost surely, 2^{1020220120021} is an apocalyptic number.

It is an amenable number.

1020220120021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020220120021 is an equidigital number, since it uses as much as digits as its factorization.

1020220120021 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 1020220120021 its reverse (1200210220201), we get a palindrome (2220430340222).

The spelling of 1020220120021 in words is "one trillion, twenty billion, two hundred twenty million, one hundred twenty thousand, twenty-one".