1011001111221 has 8 divisors (see below), whose sum is σ = 1348030693504. Its totient is φ = 673986134880.

The previous prime is 1011001111189. The next prime is 1011001111229. The reversal of 1011001111221 is 1221111001101.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1011001111221 - 2⁵ = 1011001111189 is a prime.

It is a super-2 number, since 2×1011001111221² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1011001111197 and 1011001111206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011001111229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3488941 + ... + 3767586.

It is an arithmetic number, because the mean of its divisors is an integer number (168503836688).

Almost surely, 2^{1011001111221} is an apocalyptic number.

It is an amenable number.

1011001111221 is a deficient number, since it is larger than the sum of its proper divisors (337029582283).

1011001111221 is an equidigital number, since it uses as much as digits as its factorization.

1011001111221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7302971.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1011001111221 its reverse (1221111001101), we get a palindrome (2232112112322).

The spelling of 1011001111221 in words is "one trillion, eleven billion, one million, one hundred eleven thousand, two hundred twenty-one".