1002221020021 has 4 divisors (see below), whose sum is σ = 1079314944652. Its totient is φ = 925127095392.

The previous prime is 1002221019979. The next prime is 1002221020027. The reversal of 1002221020021 is 1200201222001.

It is a happy number.

1002221020021 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 69084339921 + 933136680100 = 262839^2 + 965990^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002221020021 - 2¹⁵ = 1002220987253 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 77093924617 = 1002221020021 / (1 + 0 + 0 + 2 + 2 + 2 + 1 + 0 + 2 + 0 + 0 + 2 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1002221019983 and 1002221020010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002221020027) 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, 38546962296 + ... + 38546962321.

It is an arithmetic number, because the mean of its divisors is an integer number (269828736163).

Almost surely, 2^{1002221020021} is an apocalyptic number.

It is an amenable number.

1002221020021 is a deficient number, since it is larger than the sum of its proper divisors (77093924631).

1002221020021 is an equidigital number, since it uses as much as digits as its factorization.

1002221020021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77093924630.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1002221020021 its reverse (1200201222001), we get a palindrome (2202422242022).

The spelling of 1002221020021 in words is "one trillion, two billion, two hundred twenty-one million, twenty thousand, twenty-one".