20010100501 has 2 divisors, whose sum is σ = 20010100502. Its totient is φ = 20010100500.

The previous prime is 20010100489. The next prime is 20010100547. The reversal of 20010100501 is 10500101002.

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., 18423990225 + 1586110276 = 135735^2 + 39826^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010100501 - 2¹¹ = 20010098453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20010100571) 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, 10005050250 + 10005050251.

It is an arithmetic number, because the mean of its divisors is an integer number (10005050251).

Almost surely, 2^20010100501 is an apocalyptic number.

It is an amenable number.

20010100501 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010100501 is an equidigital number, since it uses as much as digits as its factorization.

20010100501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 10.

Adding to 20010100501 its reverse (10500101002), we get a palindrome (30510201503).

The spelling of 20010100501 in words is "twenty billion, ten million, one hundred thousand, five hundred one".