2001220000501 has 2 divisors, whose sum is σ = 2001220000502. Its totient is φ = 2001220000500.

The previous prime is 2001220000453. The next prime is 2001220000529. The reversal of 2001220000501 is 1050000221002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1543932987601 + 457287012900 = 1242551^2 + 676230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2001220000501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001220000601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610000250 + 1000610000251.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610000251).

Almost surely, 2^{2001220000501} is an apocalyptic number.

It is an amenable number.

2001220000501 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220000501 is an equidigital number, since it uses as much as digits as its factorization.

2001220000501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40, while the sum is 13.

Adding to 2001220000501 its reverse (1050000221002), we get a palindrome (3051220221503).

The spelling of 2001220000501 in words is "two trillion, one billion, two hundred twenty million, five hundred one", and thus it is an aban number.