1011221222001 has 64 divisors (see below), whose sum is σ = 1497504153600. Its totient is φ = 604092734784.

The previous prime is 1011221221991. The next prime is 1011221222023. The reversal of 1011221222001 is 1002221221101.

It is not a de Polignac number, because 1011221222001 - 2⁹ = 1011221221489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1011221220001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 100324480 + ... + 100334558.

It is an arithmetic number, because the mean of its divisors is an integer number (23398502400).

Almost surely, 2^{1011221222001} is an apocalyptic number.

It is an amenable number.

1011221222001 is a deficient number, since it is larger than the sum of its proper divisors (486282931599).

1011221222001 is a wasteful number, since it uses less digits than its factorization.

1011221222001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10970.

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

Adding to 1011221222001 its reverse (1002221221101), we get a palindrome (2013442443102).

The spelling of 1011221222001 in words is "one trillion, eleven billion, two hundred twenty-one million, two hundred twenty-two thousand, one".