1011112001221 has 8 divisors (see below), whose sum is σ = 1155572369984. Its totient is φ = 866655581760.

The previous prime is 1011112001219. The next prime is 1011112001279. The reversal of 1011112001221 is 1221002111101.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1011112001221 - 2¹ = 1011112001219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011112001281) 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, 416715 + ... + 1481848.

It is an arithmetic number, because the mean of its divisors is an integer number (144446546248).

Almost surely, 2^{1011112001221} is an apocalyptic number.

It is an amenable number.

1011112001221 is a deficient number, since it is larger than the sum of its proper divisors (144460368763).

1011112001221 is an equidigital number, since it uses as much as digits as its factorization.

1011112001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1974651.

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

Adding to 1011112001221 its reverse (1221002111101), we get a palindrome (2232114112322).

The spelling of 1011112001221 in words is "one trillion, eleven billion, one hundred twelve million, one thousand, two hundred twenty-one".