1021221021111 has 8 divisors (see below), whose sum is σ = 1361679794544. Its totient is φ = 680788130880.

The previous prime is 1021221021089. The next prime is 1021221021127. The reversal of 1021221021111 is 1111201221201.

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 1021221021111 - 2⁷ = 1021221020983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021221021511) 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, 6378550 + ... + 6536691.

It is an arithmetic number, because the mean of its divisors is an integer number (170209974318).

Almost surely, 2^{1021221021111} is an apocalyptic number.

1021221021111 is a deficient number, since it is larger than the sum of its proper divisors (340458773433).

1021221021111 is a wasteful number, since it uses less digits than its factorization.

1021221021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12941601.

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

Adding to 1021221021111 its reverse (1111201221201), we get a palindrome (2132422242312).

The spelling of 1021221021111 in words is "one trillion, twenty-one billion, two hundred twenty-one million, twenty-one thousand, one hundred eleven".