1011112021221 has 8 divisors (see below), whose sum is σ = 1406764551360. Its totient is φ = 644767085952.

The previous prime is 1011112021219. The next prime is 1011112021237. The reversal of 1011112021221 is 1221202111101.

It is a happy number.

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

It is not a de Polignac number, because 1011112021221 - 2¹ = 1011112021219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1011112021221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1011112021201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7326898636 + ... + 7326898773.

It is an arithmetic number, because the mean of its divisors is an integer number (175845568920).

Almost surely, 2^{1011112021221} is an apocalyptic number.

It is an amenable number.

1011112021221 is a deficient number, since it is larger than the sum of its proper divisors (395652530139).

1011112021221 is a wasteful number, since it uses less digits than its factorization.

1011112021221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14653797435.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1011112021221 its reverse (1221202111101), we get a palindrome (2232314132322).

The spelling of 1011112021221 in words is "one trillion, eleven billion, one hundred twelve million, twenty-one thousand, two hundred twenty-one".