20020200010021 has 4 divisors (see below), whose sum is σ = 20020222743052. Its totient is φ = 20020177276992.

The previous prime is 20020200010003. The next prime is 20020200010039. The reversal of 20020200010021 is 12001000202002.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (20020200010003) and next prime (20020200010039).

It can be written as a sum of positive squares in 2 ways, for example, as 1392905085796 + 18627294924225 = 1180214^2 + 4315935^2 .

It is a cyclic number.

It is not a de Polignac number, because 20020200010021 - 2²⁵ = 20020166455589 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 (20020200010001) 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, 9989946 + ... + 11825371.

It is an arithmetic number, because the mean of its divisors is an integer number (5005055685763).

Almost surely, 2^{20020200010021} is an apocalyptic number.

It is an amenable number.

20020200010021 is a deficient number, since it is larger than the sum of its proper divisors (22733031).

20020200010021 is an equidigital number, since it uses as much as digits as its factorization.

20020200010021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22733030.

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

Adding to 20020200010021 its reverse (12001000202002), we get a palindrome (32021200212023).

The spelling of 20020200010021 in words is "twenty trillion, twenty billion, two hundred million, ten thousand, twenty-one".