1001011201221 has 8 divisors (see below), whose sum is σ = 1334703857344.
Its totient is φ = 667329672960.
The previous prime is 1001011201189. The next prime is 1001011201261. The reversal of 1001011201221 is 1221021101001.
It is a sphenic number, since it is the product of 3 distinct primes.
It is not a de Polignac number, because 1001011201221 - 25 = 1001011201189 is a prime.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 1001011201197 and 1001011201206.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1001011201261) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2569756 + ... + 2933541.
It is an arithmetic number, because the mean of its divisors is an integer number (166837982168).
Almost surely, 21001011201221 is an apocalyptic number.
It is an amenable number.
1001011201221 is a deficient number, since it is larger than the sum of its proper divisors (333692656123).
1001011201221 is an equidigital number, since it uses as much as digits as its factorization.
1001011201221 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 5563931.
The product of its (nonzero) digits is 8, while the sum is 12.
Adding to 1001011201221 its reverse (1221021101001), we get a palindrome (2222032302222).
The spelling of 1001011201221 in words is "one trillion, one billion, eleven million, two hundred one thousand, two hundred twenty-one".