20213113213 has 4 divisors (see below), whose sum is σ = 20226163900. Its totient is φ = 20200062528.

The previous prime is 20213113211. The next prime is 20213113223. The reversal of 20213113213 is 31231131202.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31231131202 = 2 ⋅15615565601.

It can be written as a sum of positive squares in 2 ways, for example, as 2352929049 + 17860184164 = 48507^2 + 133642^2 .

It is a cyclic number.

It is not a de Polignac number, because 20213113213 - 2¹ = 20213113211 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 (20213113211) 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, 6523020 + ... + 6526117.

It is an arithmetic number, because the mean of its divisors is an integer number (5056540975).

Almost surely, 2^20213113213 is an apocalyptic number.

It is an amenable number.

20213113213 is a deficient number, since it is larger than the sum of its proper divisors (13050687).

20213113213 is a wasteful number, since it uses less digits than its factorization.

20213113213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13050686.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20213113213 its reverse (31231131202), we get a palindrome (51444244415).

The spelling of 20213113213 in words is "twenty billion, two hundred thirteen million, one hundred thirteen thousand, two hundred thirteen".