20002121233177 has 2 divisors, whose sum is σ = 20002121233178. Its totient is φ = 20002121233176.

The previous prime is 20002121233099. The next prime is 20002121233261. The reversal of 20002121233177 is 77133212120002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18693421840921 + 1308699392256 = 4323589^2 + 1143984^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20002121233177 is a prime.

It is not a weakly prime, because it can be changed into another prime (20002121233777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001060616588 + 10001060616589.

It is an arithmetic number, because the mean of its divisors is an integer number (10001060616589).

Almost surely, 2^{20002121233177} is an apocalyptic number.

It is an amenable number.

20002121233177 is a deficient number, since it is larger than the sum of its proper divisors (1).

20002121233177 is an equidigital number, since it uses as much as digits as its factorization.

20002121233177 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

Adding to 20002121233177 its reverse (77133212120002), we get a palindrome (97135333353179).

The spelling of 20002121233177 in words is "twenty trillion, two billion, one hundred twenty-one million, two hundred thirty-three thousand, one hundred seventy-seven".