1001220021001 has 32 divisors (see below), whose sum is σ = 1133304635520. Its totient is φ = 878831078400.

The previous prime is 1001220020981. The next prime is 1001220021083. The reversal of 1001220021001 is 1001200221001.

1001220021001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001220021001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1001220021401) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35065791 + ... + 35094331.

It is an arithmetic number, because the mean of its divisors is an integer number (35415769860).

Almost surely, 2^{1001220021001} is an apocalyptic number.

It is an amenable number.

1001220021001 is a deficient number, since it is larger than the sum of its proper divisors (132084614519).

1001220021001 is a wasteful number, since it uses less digits than its factorization.

1001220021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30265.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1001220021001 its reverse (1001200221001), we get a palindrome (2002420242002).

The spelling of 1001220021001 in words is "one trillion, one billion, two hundred twenty million, twenty-one thousand, one".