20010021030221 has 4 divisors (see below), whose sum is σ = 20059921332444. Its totient is φ = 19960120728000.

The previous prime is 20010021030163. The next prime is 20010021030281. The reversal of 20010021030221 is 12203012001002.

It is a happy number.

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 13403938777321 + 6606082252900 = 3661139^2 + 2570230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20010021030221 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010021030196 and 20010021030205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010021030281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24950150510 + ... + 24950151311.

It is an arithmetic number, because the mean of its divisors is an integer number (5014980333111).

Almost surely, 2^{20010021030221} is an apocalyptic number.

It is an amenable number.

20010021030221 is a deficient number, since it is larger than the sum of its proper divisors (49900302223).

20010021030221 is an equidigital number, since it uses as much as digits as its factorization.

20010021030221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49900302222.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20010021030221 its reverse (12203012001002), we get a palindrome (32213033031223).

The spelling of 20010021030221 in words is "twenty trillion, ten billion, twenty-one million, thirty thousand, two hundred twenty-one".