20021300002021 has 4 divisors (see below), whose sum is σ = 20246258429100. Its totient is φ = 19796341574944.

The previous prime is 20021300002019. The next prime is 20021300002049. The reversal of 20021300002021 is 12020000312002.

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 12261097512225 + 7760202489796 = 3501585^2 + 2785714^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021300002021 - 2¹ = 20021300002019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20021300001992 and 20021300002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021300002321) 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, 112479213406 + ... + 112479213583.

It is an arithmetic number, because the mean of its divisors is an integer number (5061564607275).

Almost surely, 2^{20021300002021} is an apocalyptic number.

It is an amenable number.

20021300002021 is a deficient number, since it is larger than the sum of its proper divisors (224958427079).

20021300002021 is an equidigital number, since it uses as much as digits as its factorization.

20021300002021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224958427078.

The product of its (nonzero) digits is 48, while the sum is 13.

Adding to 20021300002021 its reverse (12020000312002), we get a palindrome (32041300314023).

The spelling of 20021300002021 in words is "twenty trillion, twenty-one billion, three hundred million, two thousand, twenty-one".