1121021221001 has 16 divisors (see below), whose sum is σ = 1317267836928. Its totient is φ = 943355859600.

The previous prime is 1121021220989. The next prime is 1121021221051. The reversal of 1121021221001 is 1001221201211.

It is a de Polignac number, because none of the positive numbers 2^k-1121021221001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121021221051) 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, 71458511 + ... + 71474196.

It is an arithmetic number, because the mean of its divisors is an integer number (82329239808).

Almost surely, 2^{1121021221001} is an apocalyptic number.

1121021221001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1121021221001 is a deficient number, since it is larger than the sum of its proper divisors (196246615927).

1121021221001 is a wasteful number, since it uses less digits than its factorization.

1121021221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142932772.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1121021221001 its reverse (1001221201211), we get a palindrome (2122242422212).

The spelling of 1121021221001 in words is "one trillion, one hundred twenty-one billion, twenty-one million, two hundred twenty-one thousand, one".