20003121977 has 2 divisors, whose sum is σ = 20003121978. Its totient is φ = 20003121976.

The previous prime is 20003121973. The next prime is 20003121991. The reversal of 20003121977 is 77912130002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12582333241 + 7420788736 = 112171^2 + 86144^2 .

It is a cyclic number.

It is not a de Polignac number, because 20003121977 - 2² = 20003121973 is a prime.

It is not a weakly prime, because it can be changed into another prime (20003121973) 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, 10001560988 + 10001560989.

It is an arithmetic number, because the mean of its divisors is an integer number (10001560989).

Almost surely, 2^20003121977 is an apocalyptic number.

It is an amenable number.

20003121977 is a deficient number, since it is larger than the sum of its proper divisors (1).

20003121977 is an equidigital number, since it uses as much as digits as its factorization.

20003121977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5292, while the sum is 32.

Adding to 20003121977 its reverse (77912130002), we get a palindrome (97915251979).

The spelling of 20003121977 in words is "twenty billion, three million, one hundred twenty-one thousand, nine hundred seventy-seven".