1000020201021 has 48 divisors (see below), whose sum is σ = 1563907464000. Its totient is φ = 631463322528.

The previous prime is 1000020201017. The next prime is 1000020201029. The reversal of 1000020201021 is 1201020200001.

It is not a de Polignac number, because 1000020201021 - 2² = 1000020201017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 1000020200994 and 1000020201012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000020201029) 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 47 ways as a sum of consecutive naturals, for example, 77472450 + ... + 77485356.

It is an arithmetic number, because the mean of its divisors is an integer number (32581405500).

Almost surely, 2^{1000020201021} is an apocalyptic number.

It is an amenable number.

1000020201021 is a deficient number, since it is larger than the sum of its proper divisors (563887262979).

1000020201021 is a wasteful number, since it uses less digits than its factorization.

1000020201021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20903 (or 20878 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1000020201021 its reverse (1201020200001), we get a palindrome (2201040401022).

The spelling of 1000020201021 in words is "one trillion, twenty million, two hundred one thousand, twenty-one".