20021019097 has 2 divisors, whose sum is σ = 20021019098. Its totient is φ = 20021019096.

The previous prime is 20021019091. The next prime is 20021019143. The reversal of 20021019097 is 79091012002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17273582041 + 2747437056 = 131429^2 + 52416^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021019097 - 2¹⁵ = 20020986329 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021019091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010509548 + 10010509549.

It is an arithmetic number, because the mean of its divisors is an integer number (10010509549).

Almost surely, 2^20021019097 is an apocalyptic number.

It is an amenable number.

20021019097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021019097 is an equidigital number, since it uses as much as digits as its factorization.

20021019097 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The spelling of 20021019097 in words is "twenty billion, twenty-one million, nineteen thousand, ninety-seven".