1021022120161 has 2 divisors, whose sum is σ = 1021022120162. Its totient is φ = 1021022120160.

The previous prime is 1021022120147. The next prime is 1021022120197. The reversal of 1021022120161 is 1610212201201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 664153281936 + 356868838225 = 814956^2 + 597385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021022120161 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021022120101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510511060080 + 510511060081.

It is an arithmetic number, because the mean of its divisors is an integer number (510511060081).

Almost surely, 2^{1021022120161} is an apocalyptic number.

It is an amenable number.

1021022120161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021022120161 is an equidigital number, since it uses as much as digits as its factorization.

1021022120161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 1021022120161 its reverse (1610212201201), we get a palindrome (2631234321362).

The spelling of 1021022120161 in words is "one trillion, twenty-one billion, twenty-two million, one hundred twenty thousand, one hundred sixty-one".