1001120211221 has 4 divisors (see below), whose sum is σ = 1078129458252. Its totient is φ = 924110964192.

The previous prime is 1001120211187. The next prime is 1001120211233. The reversal of 1001120211221 is 1221120211001.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 155621571121 + 845498640100 = 394489^2 + 919510^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1001120211221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001120211196 and 1001120211205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001120511221) 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, 38504623496 + ... + 38504623521.

It is an arithmetic number, because the mean of its divisors is an integer number (269532364563).

Almost surely, 2^{1001120211221} is an apocalyptic number.

It is an amenable number.

1001120211221 is a deficient number, since it is larger than the sum of its proper divisors (77009247031).

1001120211221 is an equidigital number, since it uses as much as digits as its factorization.

1001120211221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77009247030.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001120211221 its reverse (1221120211001), we get a palindrome (2222240422222).

The spelling of 1001120211221 in words is "one trillion, one billion, one hundred twenty million, two hundred eleven thousand, two hundred twenty-one".