1001122012221 has 16 divisors (see below), whose sum is σ = 1342450794048. Its totient is φ = 663605308800.

The previous prime is 1001122012217. The next prime is 1001122012259. The reversal of 1001122012221 is 1222102211001.

It is not a de Polignac number, because 1001122012221 - 2² = 1001122012217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001122012221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001122012321) 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, 2836665 + ... + 3170001.

It is an arithmetic number, because the mean of its divisors is an integer number (83903174628).

Almost surely, 2^{1001122012221} is an apocalyptic number.

It is an amenable number.

1001122012221 is a deficient number, since it is larger than the sum of its proper divisors (341328781827).

1001122012221 is a wasteful number, since it uses less digits than its factorization.

1001122012221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 339052.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1001122012221 its reverse (1222102211001), we get a palindrome (2223224223222).

The spelling of 1001122012221 in words is "one trillion, one billion, one hundred twenty-two million, twelve thousand, two hundred twenty-one".