1001221012111 has 16 divisors (see below), whose sum is σ = 1012873508064. Its totient is φ = 989639731584.

The previous prime is 1001221012109. The next prime is 1001221012189. The reversal of 1001221012111 is 1112101221001.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1001221012111 - 2¹ = 1001221012109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001221012091 and 1001221012100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001221015111) 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, 116783421 + ... + 116791993.

It is an arithmetic number, because the mean of its divisors is an integer number (63304594254).

Almost surely, 2^{1001221012111} is an apocalyptic number.

1001221012111 is a deficient number, since it is larger than the sum of its proper divisors (11652495953).

1001221012111 is a wasteful number, since it uses less digits than its factorization.

1001221012111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12570.

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

Adding to 1001221012111 its reverse (1112101221001), we get a palindrome (2113322233112).

The spelling of 1001221012111 in words is "one trillion, one billion, two hundred twenty-one million, twelve thousand, one hundred eleven".