20021110012213 has 4 divisors (see below), whose sum is σ = 20349324930508. Its totient is φ = 19692895093920.

The previous prime is 20021110012193. The next prime is 20021110012223. The reversal of 20021110012213 is 31221001112002.

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 381827598084 + 19639282414129 = 617922^2 + 4431623^2 .

It is a cyclic number.

It is not a de Polignac number, because 20021110012213 - 2¹⁷ = 20021109881141 is a prime.

It is a super-2 number, since 2×20021110012213² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20021110012223) 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, 164107459056 + ... + 164107459177.

It is an arithmetic number, because the mean of its divisors is an integer number (5087331232627).

Almost surely, 2^{20021110012213} is an apocalyptic number.

It is an amenable number.

20021110012213 is a deficient number, since it is larger than the sum of its proper divisors (328214918295).

20021110012213 is an equidigital number, since it uses as much as digits as its factorization.

20021110012213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 328214918294.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20021110012213 its reverse (31221001112002), we get a palindrome (51242111124215).

The spelling of 20021110012213 in words is "twenty trillion, twenty-one billion, one hundred ten million, twelve thousand, two hundred thirteen".