1011221021001 has 16 divisors (see below), whose sum is σ = 1371231645120. Its totient is φ = 662680280640.

The previous prime is 1011221020993. The next prime is 1011221021003. The reversal of 1011221021001 is 1001201221101.

It is not a de Polignac number, because 1011221021001 - 2³ = 1011221020993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011221021003) 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, 2850871 + ... + 3185891.

It is an arithmetic number, because the mean of its divisors is an integer number (85701977820).

Almost surely, 2^{1011221021001} is an apocalyptic number.

It is an amenable number.

1011221021001 is a deficient number, since it is larger than the sum of its proper divisors (360010624119).

1011221021001 is a wasteful number, since it uses less digits than its factorization.

1011221021001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352136.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1011221021001 its reverse (1001201221101), we get a palindrome (2012422242102).

The spelling of 1011221021001 in words is "one trillion, eleven billion, two hundred twenty-one million, twenty-one thousand, one".