1001020002221 has 4 divisors (see below), whose sum is σ = 1001074080252. Its totient is φ = 1000965924192.

The previous prime is 1001020002179. The next prime is 1001020002233. The reversal of 1001020002221 is 1222000201001.

It is a happy number.

1001020002221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 89212729225 + 911807272996 = 298685^2 + 954886^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001020002221 - 2²⁶ = 1000952893357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001020002821) 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, 27011240 + ... + 27048273.

It is an arithmetic number, because the mean of its divisors is an integer number (250268520063).

Almost surely, 2^{1001020002221} is an apocalyptic number.

It is an amenable number.

1001020002221 is a deficient number, since it is larger than the sum of its proper divisors (54078031).

1001020002221 is an equidigital number, since it uses as much as digits as its factorization.

1001020002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54078030.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1001020002221 its reverse (1222000201001), we get a palindrome (2223020203222).

The spelling of 1001020002221 in words is "one trillion, one billion, twenty million, two thousand, two hundred twenty-one".