2021121017 has 2 divisors, whose sum is σ = 2021121018. Its totient is φ = 2021121016.

The previous prime is 2021120989. The next prime is 2021121061. The reversal of 2021121017 is 7101211202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1276704361 + 744416656 = 35731^2 + 27284^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021121017 is a prime.

It is a super-2 number, since 2×2021121017² = 8169860330718228578, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021120986 and 2021121004.

It is not a weakly prime, because it can be changed into another prime (2021121077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010560508 + 1010560509.

It is an arithmetic number, because the mean of its divisors is an integer number (1010560509).

Almost surely, 2^2021121017 is an apocalyptic number.

It is an amenable number.

2021121017 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021121017 is an equidigital number, since it uses as much as digits as its factorization.

2021121017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56, while the sum is 17.

The square root of 2021121017 is about 44956.8795291666. The cubic root of 2021121017 is about 1264.3406640753.

Adding to 2021121017 its reverse (7101211202), we get a palindrome (9122332219).

The spelling of 2021121017 in words is "two billion, twenty-one million, one hundred twenty-one thousand, seventeen".