20010220102021 has 4 divisors (see below), whose sum is σ = 20034954614700. Its totient is φ = 19985485589344.

The previous prime is 20010220101983. The next prime is 20010220102027. The reversal of 20010220102021 is 12020102201002.

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 16266823236225 + 3743396865796 = 4033215^2 + 1934786^2 .

It is a cyclic number.

It is not a de Polignac number, because 20010220102021 - 2³⁵ = 19975860363653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20010220101992 and 20010220102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20010220102027) 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, 12367255126 + ... + 12367256743.

It is an arithmetic number, because the mean of its divisors is an integer number (5008738653675).

Almost surely, 2^{20010220102021} is an apocalyptic number.

It is an amenable number.

20010220102021 is a deficient number, since it is larger than the sum of its proper divisors (24734512679).

20010220102021 is an equidigital number, since it uses as much as digits as its factorization.

20010220102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24734512678.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20010220102021 its reverse (12020102201002), we get a palindrome (32030322303023).

The spelling of 20010220102021 in words is "twenty trillion, ten billion, two hundred twenty million, one hundred two thousand, twenty-one".