1221022020111 has 16 divisors (see below), whose sum is σ = 1651871501568. Its totient is φ = 802106278400.

The previous prime is 1221022020107. The next prime is 1221022020151. The reversal of 1221022020111 is 1110202201221.

It is a cyclic number.

It is not a de Polignac number, because 1221022020111 - 2² = 1221022020107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221022020151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1196946 + ... + 1968431.

It is an arithmetic number, because the mean of its divisors is an integer number (103241968848).

Almost surely, 2^{1221022020111} is an apocalyptic number.

1221022020111 is a deficient number, since it is larger than the sum of its proper divisors (430849481457).

1221022020111 is a wasteful number, since it uses less digits than its factorization.

1221022020111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3167262.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 1221022020111 its reverse (1110202201221), we get a palindrome (2331224221332).

The spelling of 1221022020111 in words is "one trillion, two hundred twenty-one billion, twenty-two million, twenty thousand, one hundred eleven".