1001231112221 has 16 divisors (see below), whose sum is σ = 1020329706240. Its totient is φ = 982276659840.

The previous prime is 1001231112191. The next prime is 1001231112257. The reversal of 1001231112221 is 1222111321001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1001231112221 - 2⁶ = 1001231112157 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001231112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001231112121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27592136 + ... + 27628398.

It is an arithmetic number, because the mean of its divisors is an integer number (63770606640).

Almost surely, 2^{1001231112221} is an apocalyptic number.

It is an amenable number.

1001231112221 is a deficient number, since it is larger than the sum of its proper divisors (19098594019).

1001231112221 is a wasteful number, since it uses less digits than its factorization.

1001231112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38236.

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

Adding to 1001231112221 its reverse (1222111321001), we get a palindrome (2223342433222).

The spelling of 1001231112221 in words is "one trillion, one billion, two hundred thirty-one million, one hundred twelve thousand, two hundred twenty-one".