21010010213243 has 8 divisors (see below), whose sum is σ = 21220677992976. Its totient is φ = 20800104343200.

The previous prime is 21010010213147. The next prime is 21010010213267. The reversal of 21010010213243 is 34231201001012.

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 21010010213243 - 2²⁰ = 21010009164667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21010010213273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190421996 + ... + 190532297.

It is an arithmetic number, because the mean of its divisors is an integer number (2652584749122).

Almost surely, 2^{21010010213243} is an apocalyptic number.

21010010213243 is a deficient number, since it is larger than the sum of its proper divisors (210667779733).

21010010213243 is a wasteful number, since it uses less digits than its factorization.

21010010213243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380954845.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21010010213243 its reverse (34231201001012), we get a palindrome (55241211214255).

The spelling of 21010010213243 in words is "twenty-one trillion, ten billion, ten million, two hundred thirteen thousand, two hundred forty-three".