2001220111061 has 2 divisors, whose sum is σ = 2001220111062. Its totient is φ = 2001220111060.

The previous prime is 2001220111049. The next prime is 2001220111117. The reversal of 2001220111061 is 1601110221002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1572280256836 + 428939854225 = 1253906^2 + 654935^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001220111061 - 2¹⁴ = 2001220094677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001220111861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610055530 + 1000610055531.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610055531).

Almost surely, 2^{2001220111061} is an apocalyptic number.

It is an amenable number.

2001220111061 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001220111061 is an equidigital number, since it uses as much as digits as its factorization.

2001220111061 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 2001220111061 its reverse (1601110221002), we get a palindrome (3602330332063).

The spelling of 2001220111061 in words is "two trillion, one billion, two hundred twenty million, one hundred eleven thousand, sixty-one".