20211043123213 has 8 divisors (see below), whose sum is σ = 20493403974648. Its totient is φ = 19930498097664.

The previous prime is 20211043123207. The next prime is 20211043123277. The reversal of 20211043123213 is 31232134011202.

It can be written as a sum of positive squares in 4 ways, for example, as 1598876794089 + 18612166329124 = 1264467^2 + 4314182^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20211043123213 - 2⁴¹ = 18012019867661 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 (20211043126213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 453934056 + ... + 453978577.

It is an arithmetic number, because the mean of its divisors is an integer number (2561675496831).

Almost surely, 2^{20211043123213} is an apocalyptic number.

It is an amenable number.

20211043123213 is a deficient number, since it is larger than the sum of its proper divisors (282360851435).

20211043123213 is a wasteful number, since it uses less digits than its factorization.

20211043123213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907912943.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 20211043123213 its reverse (31232134011202), we get a palindrome (51443177134415).

The spelling of 20211043123213 in words is "twenty trillion, two hundred eleven billion, forty-three million, one hundred twenty-three thousand, two hundred thirteen".