1001012221111 has 40 divisors (see below), whose sum is σ = 1180080570880. Its totient is φ = 849007583424.

The previous prime is 1001012221073. The next prime is 1001012221123. The reversal of 1001012221111 is 1111222101001.

It is a happy number.

It is not a de Polignac number, because 1001012221111 - 2¹³ = 1001012212919 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001012221091 and 1001012221100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001012221211) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 121051885 + ... + 121060153.

It is an arithmetic number, because the mean of its divisors is an integer number (29502014272).

Almost surely, 2^{1001012221111} is an apocalyptic number.

1001012221111 is a deficient number, since it is larger than the sum of its proper divisors (179068349769).

1001012221111 is an frugal number, since it uses more digits than its factorization.

1001012221111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8800 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 1001012221111 its reverse (1111222101001), we get a palindrome (2112234322112).

The spelling of 1001012221111 in words is "one trillion, one billion, twelve million, two hundred twenty-one thousand, one hundred eleven".