20100100073 has 2 divisors, whose sum is σ = 20100100074. Its totient is φ = 20100100072.

The previous prime is 20100100051. The next prime is 20100100087. The reversal of 20100100073 is 37000100102.

It is an a-pointer prime, because the next prime (20100100087) can be obtained adding 20100100073 to its sum of digits (14).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12911095129 + 7189004944 = 113627^2 + 84788^2 .

It is a cyclic number.

It is not a de Polignac number, because 20100100073 - 2¹⁰ = 20100099049 is a prime.

It is a super-2 number, since 2×20100100073² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20100102073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050050036 + 10050050037.

It is an arithmetic number, because the mean of its divisors is an integer number (10050050037).

Almost surely, 2^20100100073 is an apocalyptic number.

It is an amenable number.

20100100073 is a deficient number, since it is larger than the sum of its proper divisors (1).

20100100073 is an equidigital number, since it uses as much as digits as its factorization.

20100100073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 14.

Adding to 20100100073 its reverse (37000100102), we get a palindrome (57100200175).

The spelling of 20100100073 in words is "twenty billion, one hundred million, one hundred thousand, seventy-three".