20442021097 has 2 divisors, whose sum is σ = 20442021098. Its totient is φ = 20442021096.

The previous prime is 20442021079. The next prime is 20442021133. The reversal of 20442021097 is 79012024402.

Together with previous prime (20442021079) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17507523856 + 2934497241 = 132316^2 + 54171^2 .

It is a cyclic number.

It is not a de Polignac number, because 20442021097 - 2³¹ = 18294537449 is a prime.

It is not a weakly prime, because it can be changed into another prime (20442021797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10221010548 + 10221010549.

It is an arithmetic number, because the mean of its divisors is an integer number (10221010549).

Almost surely, 2^20442021097 is an apocalyptic number.

It is an amenable number.

20442021097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20442021097 is an equidigital number, since it uses as much as digits as its factorization.

20442021097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

Adding to 20442021097 its reverse (79012024402), we get a palindrome (99454045499).

The spelling of 20442021097 in words is "twenty billion, four hundred forty-two million, twenty-one thousand, ninety-seven".