20021102177 has 2 divisors, whose sum is σ = 20021102178. Its totient is φ = 20021102176.

The previous prime is 20021102149. The next prime is 20021102183. The reversal of 20021102177 is 77120112002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13430260321 + 6590841856 = 115889^2 + 81184^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021102177 - 2²⁶ = 19953993313 is a prime.

It is not a weakly prime, because it can be changed into another prime (20021102107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10010551088 + 10010551089.

It is an arithmetic number, because the mean of its divisors is an integer number (10010551089).

Almost surely, 2^20021102177 is an apocalyptic number.

It is an amenable number.

20021102177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20021102177 is an equidigital number, since it uses as much as digits as its factorization.

20021102177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 392, while the sum is 23.

Adding to 20021102177 its reverse (77120112002), we get a palindrome (97141214179).

The spelling of 20021102177 in words is "twenty billion, twenty-one million, one hundred two thousand, one hundred seventy-seven".