2021012221001 has 4 divisors (see below), whose sum is σ = 2021531898900. Its totient is φ = 2020492543104.

The previous prime is 2021012220947. The next prime is 2021012221043. The reversal of 2021012221001 is 1001222101202.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 771848345401 + 1249163875600 = 878549^2 + 1117660^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021012221001 - 2³⁰ = 2019938479177 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2021012221061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 259833116 + ... + 259840893.

It is an arithmetic number, because the mean of its divisors is an integer number (505382974725).

Almost surely, 2^{2021012221001} is an apocalyptic number.

It is an amenable number.

2021012221001 is a deficient number, since it is larger than the sum of its proper divisors (519677899).

2021012221001 is an equidigital number, since it uses as much as digits as its factorization.

2021012221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519677898.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 2021012221001 its reverse (1001222101202), we get a palindrome (3022234322203).

The spelling of 2021012221001 in words is "two trillion, twenty-one billion, twelve million, two hundred twenty-one thousand, one".