1021221222111 has 6 divisors (see below), whose sum is σ = 1475097320840. Its totient is φ = 680814148068.

The previous prime is 1021221222089. The next prime is 1021221222157. The reversal of 1021221222111 is 1112221221201.

1021221222111 is a `hidden beast` number, since 10 + 212 + 212 + 221 + 11 = 666.

It is not a de Polignac number, because 1021221222111 - 2¹⁹ = 1021220697823 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 (1021221222211) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56734512331 + ... + 56734512348.

Almost surely, 2^{1021221222111} is an apocalyptic number.

1021221222111 is a deficient number, since it is larger than the sum of its proper divisors (453876098729).

1021221222111 is a wasteful number, since it uses less digits than its factorization.

1021221222111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113469024685 (or 113469024682 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1021221222111 its reverse (1112221221201), we get a palindrome (2133442443312).

The spelling of 1021221222111 in words is "one trillion, twenty-one billion, two hundred twenty-one million, two hundred twenty-two thousand, one hundred eleven".