1020201002021 has 8 divisors (see below), whose sum is σ = 1023715576440. Its totient is φ = 1016692351168.

The previous prime is 1020201002003. The next prime is 1020201002113. The reversal of 1020201002021 is 1202001020201.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 900384640996 + 119816361025 = 948886^2 + 346145^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1020201002021 - 2²² = 1020196807717 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020201001993 and 1020201002011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020201002221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135706 + ... + 1824891.

It is an arithmetic number, because the mean of its divisors is an integer number (127964447055).

Almost surely, 2^{1020201002021} is an apocalyptic number.

It is an amenable number.

1020201002021 is a deficient number, since it is larger than the sum of its proper divisors (3514574419).

1020201002021 is an equidigital number, since it uses as much as digits as its factorization.

1020201002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2961783.

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

Adding to 1020201002021 its reverse (1202001020201), we get a palindrome (2222202022222).

The spelling of 1020201002021 in words is "one trillion, twenty billion, two hundred one million, two thousand, twenty-one".