1221020022101 has 16 divisors (see below), whose sum is σ = 1349503027200. Its totient is φ = 1095545455680.

The previous prime is 1221020022067. The next prime is 1221020022121. The reversal of 1221020022101 is 1012200201221.

It is a cyclic number.

It is not a de Polignac number, because 1221020022101 - 2¹⁴ = 1221020005717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221020022121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2115221 + ... + 2629866.

It is an arithmetic number, because the mean of its divisors is an integer number (84343939200).

Almost surely, 2^{1221020022101} is an apocalyptic number.

1221020022101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1221020022101 is a deficient number, since it is larger than the sum of its proper divisors (128483005099).

1221020022101 is a wasteful number, since it uses less digits than its factorization.

1221020022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4745404.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1221020022101 its reverse (1012200201221), we get a palindrome (2233220223322).

The spelling of 1221020022101 in words is "one trillion, two hundred twenty-one billion, twenty million, twenty-two thousand, one hundred one".