201221002121017 has 4 divisors (see below), whose sum is σ = 201221563810816. Its totient is φ = 201220440431220.

The previous prime is 201221002121011. The next prime is 201221002121021. The reversal of 201221002121017 is 710121200122102.

201221002121017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 201221002121017 - 2⁴³ = 192424909098809 is a prime.

It is a super-2 number, since 2×201221002121017² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201221002121011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 280307193 + ... + 281024134.

It is an arithmetic number, because the mean of its divisors is an integer number (50305390952704).

Almost surely, 2^{201221002121017} is an apocalyptic number.

It is an amenable number.

201221002121017 is a deficient number, since it is larger than the sum of its proper divisors (561689799).

201221002121017 is an equidigital number, since it uses as much as digits as its factorization.

201221002121017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561689798.

The product of its (nonzero) digits is 224, while the sum is 22.

Adding to 201221002121017 its reverse (710121200122102), we get a palindrome (911342202243119).

The spelling of 201221002121017 in words is "two hundred one trillion, two hundred twenty-one billion, two million, one hundred twenty-one thousand, seventeen".