1221022001101 has 16 divisors (see below), whose sum is σ = 1441088208000. Its totient is φ = 1033980741024.

The previous prime is 1221022001053. The next prime is 1221022001117. The reversal of 1221022001101 is 1011002201221.

It is not a de Polignac number, because 1221022001101 - 2¹⁵ = 1221021968333 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221022001141) 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, 21416296 + ... + 21473233.

It is an arithmetic number, because the mean of its divisors is an integer number (90068013000).

Almost surely, 2^{1221022001101} is an apocalyptic number.

It is an amenable number.

1221022001101 is a deficient number, since it is larger than the sum of its proper divisors (220066206899).

1221022001101 is an frugal number, since it uses more digits than its factorization.

1221022001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42889633 (or 42889619 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1221022001101 its reverse (1011002201221), we get a palindrome (2232024202322).

The spelling of 1221022001101 in words is "one trillion, two hundred twenty-one billion, twenty-two million, one thousand, one hundred one".