10002020002021 has 4 divisors (see below), whose sum is σ = 10346917243500. Its totient is φ = 9657122760544.

The previous prime is 10002020001977. The next prime is 10002020002031. The reversal of 10002020002021 is 12020002020001.

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 8546787933121 + 1455232068900 = 2923489^2 + 1206330^2 .

It is a cyclic number.

It is not a de Polignac number, because 10002020002021 - 2²¹ = 10002017904869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10002020001989 and 10002020002007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10002020002031) 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, 172448620696 + ... + 172448620753.

It is an arithmetic number, because the mean of its divisors is an integer number (2586729310875).

Almost surely, 2^{10002020002021} is an apocalyptic number.

It is an amenable number.

10002020002021 is a deficient number, since it is larger than the sum of its proper divisors (344897241479).

10002020002021 is an equidigital number, since it uses as much as digits as its factorization.

10002020002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344897241478.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 10002020002021 its reverse (12020002020001), we get a palindrome (22022022022022).

The spelling of 10002020002021 in words is "ten trillion, two billion, twenty million, two thousand, twenty-one".