20021128097 has 2 divisors, whose sum is σ = 20021128098. Its totient is φ = 20021128096.

The previous prime is 20021128051. The next prime is 20021128163. The reversal of 20021128097 is 79082112002.

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., 14359468561 + 5661659536 = 119831^2 + 75244^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021128097 - 2¹⁰ = 20021127073 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021128397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010564048 + 10010564049.

It is an arithmetic number, because the mean of its divisors is an integer number (10010564049).

Almost surely, 2^20021128097 is an apocalyptic number.

It is an amenable number.

20021128097 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021128097 is an equidigital number, since it uses as much as digits as its factorization.

20021128097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The spelling of 20021128097 in words is "twenty billion, twenty-one million, one hundred twenty-eight thousand, ninety-seven".